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DTSTART:20210101T000000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20230407T160000
DTEND;TZID=Europe/Moscow:20230407T170000
DTSTAMP:20260905T164629
CREATED:20230403T120948Z
LAST-MODIFIED:20230403T120948Z
UID:7562-1680883200-1680886800@unam.bilkent.edu.tr
SUMMARY:Structure Control in Biomimetic Hybrid Membranes: From Molecular Engineering to In-operando Characterisation
DESCRIPTION:Amin Sadeghpour Dilmaghani\nUniversity of Leeds \n\nThe properties and function of advanced materials in biomimetic environments are associated with their morphology\, hierarchy\, anisotropy and mechanical properties. For instance\, the structural morphology of biopolymer networks in cellular scaffolds is known to play important roles in cellular adhesion and proliferation\, controlling the tissue homeostasis. The ability to engineer nanostructured soft materials with multiscale hierarchy by sustainable approaches (e.g. free of chemical cross linking)\, yet offering appropriate porosity and mechanical stability remains a great challenge in engineering advanced functional food and biomaterials.\nIn this seminar\, I will present our recent development in fabrication of novel hybrid lipid-polymer membranes by introducing unique nanostructures from lipid self-assemblies into biopolymer networks.1\, 2 I will also discuss the state of the art in-situ X-ray scattering analytical methods that we applied to understanding of structure-function correlations in hybrid systems and their potential applications as cell substrates. \n \n1. Yuan\, Y.; Shi\, Y.; Banerjee\, J.; Sadeghpour\, A.; Azevedo\, H. S.\, Materials Today Bio 2023\, 100598.\n2. Tien\, N. D.; Maurya\, A. K.; Fortunato\, G.; Rottmar\, M.; Zboray\, R.; Erni\, R.; Dommann\, A.; Rossi\, R. M.; Neels\, A.; Sadeghpour\, A.\, Langmuir 2020\, 36 (40)\, 11787-11797. \n  \n  \nAbout Speaker\n  \nDr. Amin Sadeghpour is a Lecturer in Food Nanostructures and Processing at the School of Food Science and Nutrition\, the University of Leeds\, UK. His expertise is in the area of colloids & functional nanomaterials and the application of Small- and Wide-Angle X-ray Scattering (SAXS/WAXS) techniques. Amin received his PhD in Colloids and Surface Chemistry from the University of Geneva in Switzerland under the supervision of Prof Michal Borkovec. Prior to his current position\, Amin was appointed a leading position at the Centre for X-ray Analytics of Empa – the Swiss Federal Laboratories of Materials Science and Technology.\nAmin’s research focuses on understanding the correlations between the soft matter nanostructures and their interactions with the biological environment. He is particularly interested in the design\, processing and characterisation of biomimetic systems\, i.e.\, in lipid-polymer hybrid materials with responsive nanoscale hierarchy and controlled functions for applications in food bioprocessing and nutraceutical delivery. His research includes the development and application of in-situ X-ray analytics (SAXS/WAXS) to elucidate the structural dynamics in the advanced materials. \nZoom Conference \n  \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/structure-control-in-biomimetic-hybrid-membranes-from-molecular-engineering-to-in-operando-characterisation/
CATEGORIES:Nanocolloquium Series
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2023/04/Amin-Sadeghpour-Dilmaghani.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20221125T160000
DTEND;TZID=Europe/Moscow:20221125T170000
DTSTAMP:20260905T164629
CREATED:20221121T112949Z
LAST-MODIFIED:20230403T121046Z
UID:7076-1669392000-1669395600@unam.bilkent.edu.tr
SUMMARY:Novel electronic properties of quantum critical Dirac plasma
DESCRIPTION:Alexey Berdyugin\nThe National University of Singapore \n\nThe most recognizable feature of graphene’s electronic spectrum is its Dirac point around which interesting phenomena tend to cluster. At elevated temperatures thermal excitations can overcome the disorder and create an electron-hole (e-h) plasma of Dirac fermions. The Dirac plasma has recently been found to exhibit unusual properties including quantum critical conductivity and hydrodynamic flow.\nFirst\, I’ll discuss our recent work on magnetotransport properties of Dirac plasma in graphene. In low magnetic field\, the plasma exhibits giant magnetoresistivity reaching >100% in 0.1 T even at room temperature. This is orders of magnitude higher than magnetoresistivity found in any other system at such temperatures and originates from the exceptional mobility of graphene at the neutrality point. With the onset of Landau quantization in a few T\, where the e-h plasma resides on the zeroth Landau level\, giant linear magnetoresistivity emerges which is sensitive to the Columb interaction in the system.\nIn the second part of my talk\, I’ll discuss the out-of-equilibrium transport in twisted bilayer graphene and other graphene superlattices which is\, surprisingly\, closely related to the Dirac plasma. Due to small number of carriers and reduced Fermi velocity\, even moderate current bias in those systems produces a strong shift of Fermi surface. That leads to the current-critical behavior with superconducting-like IV curves. Criticalities develop when the drift velocity of electrons flow approach the Fermi velocity of the system. The observed anomaly caused by the Schwinger-like production of electron-hole plasma. The observed behavior is expected to be common for all 2D superlattices. \n  \n  \n  \nAbout Speaker\n  \nProf Alexey Berdyugin studied at the Moscow Phystech (which is the most prestigious university for natural science in Russia) from 2010 to 2016\, where he received his bachelor and master degrees in condensed matter physics. Next\, he conducted doctoral research at the University of Manchester under the supervision of Sir. Andre Geim and Prof. Irina Grigorieva. During that time\, he has been focusing on the transport properties of novel van der Waals materials. He received his PhD in Nanoscience in May 2020. After that\, he carried on his work in United Kingdom and focused on a non-linear current propagation regime in novel 2D superlattices. Recently he has received a prestigious NUS Presidential Young Professorship award and joined the MSE and Physics departments. \nUNAM Conference Hall\, \n  \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/novel-electronic-properties-of-quantum-critical-dirac-plasma/
CATEGORIES:Nanocolloquium Series
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2022/11/Alexey-Berdyugin.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20221014T160000
DTEND;TZID=Europe/Moscow:20221014T170000
DTSTAMP:20260905T164629
CREATED:20221010T073501Z
LAST-MODIFIED:20221010T073501Z
UID:6804-1665763200-1665766800@unam.bilkent.edu.tr
SUMMARY:Spintronics with novel two-dimensional materials
DESCRIPTION:Ahmet Avsar\nThe National University of Singapore \n\nExploitation of the intrinsic spin of an electron\, spintronics\, could facilitate the development of multifunctional and novel devices. As regards to material selection\, two-dimensional (2D) crystals and their van der Waals heterostructures could enable new spintronics functionalities that are inaccessible in conventional bulk materials [1]. To exploit the full potential of such heterostructures\, the family of 2D spin transport and magnetic materials needs to be expanded. \nIn this talk\, I will present our efforts in exploring novel materials for this emerging field. Firstly\, I will introduce ultra-thin\, semiconducting black phosphorus as a promising spin transport channel material and discuss our recent efforts focused on investigating the impact of its unique crystal structure on spin dynamics [2]. Then\, I will demonstrate inducing magnetism into an otherwise non-magnetic 2D material with the creation of some specific types of defects [3]. Finally\, I will provide an outlook about the potential of heterostructures based on such novel 2D materials for fundamental spintronics research and applications in information storage and logic devices. \n[1] A. Avsar et al.\, Rev. Mod. Phys. 92\, 021003 (2020).\n[2] A. Avsar et al.\, Nat. Phys. 13\, 888-894 (2017) & L. Cording et al.\, submitted.\n[3] A. Avsar et al.\, Nat. Nano.\, 14\, 674-678 (2019) & A. Avsar et al.\, Nat. Comm.\, 11\, 4806 (2020). \n \n  \n  \nAbout Speaker\n  \nDr Ahmet Avsar is an Assistant Professor and NRF Fellow in the Department of Material Science and Engineering at the National University of Singapore (NUS). Prior to joining NUS\, he was an Assistant Professor of Physics at Newcastle University (United Kingdom)\, and worked as an EPFL Fellow (co-funded by the European Marie Curie COFUND programme) at the Swiss Federal Institute of Technology Lausanne (EPFL\, Switzerland) between 2016 and 2020 after completing his PhD in Physics at NUS.\nAs an experimental condensed matter physicist specialized in two-dimensional (2D) materials\, Ahmet Avsar is interested in exploitation of the multiple quantum degrees of freedom (spin\, pseudospin and valley) available to 2D materials in the ultimate atomically thin limit for applications in energy-efficient information technologies (For more information: https://sites.google.com/site/aavsar). \nTopic: UNAM Nanocolloquium Series \nTime: Oct 14\, 2022 04:00 PM  \nHybrid Event \nUNAM Conference Hall\, \n& \nJoin Zoom Meeting \nhttps://zoom.us/j/5876884794?pwd=OUNFRTZKZDNRMm5MWjJjSlhnMXFNUT09\nMeeting ID: 587 688 4794\nPasscode: 871377 \n  \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/spintronics-with-novel-two-dimensional-materials/
CATEGORIES:Nanocolloquium Series
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2022/10/ahmet-avsar.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20221007T160000
DTEND;TZID=Europe/Moscow:20221007T170000
DTSTAMP:20260905T164629
CREATED:20220928T063521Z
LAST-MODIFIED:20220928T063553Z
UID:6785-1665158400-1665162000@unam.bilkent.edu.tr
SUMMARY:Perfect transfer of waves
DESCRIPTION:Q-Han Park\nKorea University \n\nWaves\, both classical and quantum\, are reflected when they encounter different media or potential regions. Reflection is a fundamental property of waves underlying numerous scientific applications. Nevertheless\, in many cases removing reflection is a key issue to secure transmission and increase device efficiencies. Since the early works of Brewster and Rayleigh\, much effort has been made to remove reflection\, or achieve so called anti-reflection (AR). The most well-known AR coating\, based on a simple interference principle of optics\, only works for specific frequencies and incidence angles. Despite efforts to extend AR to broader frequency\, progress was achieved mainly by the trial-and-error optimization in designing multilayer AR structures. So far\, AR has been regarded as a technological issue without much room for further fundamental understanding. \nHere\, we uncover a principle of universal impedance matching (UIM) that allows a complete removal of reflection regardless of the incidence angle and the frequency of incoming waves. In the case of electromagnetic waves\, we reformulate the Maxwell’s equation in terms of impedance and admittance functions and directly establish the inverse scattering relation between scattered fields and material parameters\, i.e.\, permittivity and permeability. Particularly\, from the inverse scattering relation we find that the perfectly vanishing reflection\, omnidirectional and frequency independent\, can be explicitly realized by spatiotemporally dispersive materials. As a demonstration\, we introduce an UIM coating that enables the perfect transmission of white light in heterogeneous transparent media. We also present an experimental realization of UIM using metamaterials. \nThe complete removal of reflection based on UIM can be extended to various physical situations\, such as light reflection at curved surface interfaces\, reflection at the junction two different waveguides\, total internal reflections\, reflection of acoustic and elastic waves and reflection of quantum matter waves at potential steps. We explain how UIM can be extended to these physical systems and applied to practical devices. \n \n  \n  \nAbout Speaker\n  \nDr. Q-Han Park is currently Professor in Physics at Korea University in South Korea. He received his Ph.D. degree in Physics from Brandeis University\, United States in 1987. He was a Postdoctoral Research Fellow at University of Cambridge with Stephen Hawking from 1990 to 1992. Afterwards he was a research associate at CERN\, Switzerland\, a visiting scholar at MIT\, United States\, and a senior visiting fellow at the Institute of Optics\, United States. He then joined Kyunghee University in South Korea as Assistant Professor in 1992\, and moved to Korea University in 2001. \nDr. Park served as a director of Research Institute Basic Sciences in Korea\, and an associated editor for Optics Express of the Optical Society of America. Dr. Park is currently Fellow of the Korean Academy of Science and Technology\, American Optical Society\, Optical Society of Korea\, and Korean Physical Society. He is also serving as Director of the Center for Electromagnetic Metamaterials of Korea University and Consultant of Samsung Advanced Institute of Technology. He has received the prestigious Korean Science Award by the Ministry of Science and ICT in 2020. \nDr. Park’s research has been focused on high energy physics until the year of 2000 and switched to the field of optics. Since then\, he published high impact papers on optics including five papers in Nature Photonics and holds 35 patents. In earlier works\, he made significant theoretical advances in Plasmonics. His recent research topics include universal impedance matching and non-local metamaterials. He has authored more than 200 journal articles and 47 patents. More details can be found on his homepage (http://nol.korea.ac.kr/). \nTopic: Nanocolloquium Series\nTime: Oct 7\, 2022 04:00 PM Istanbul\nJoin Zoom Meeting\nhttps://zoom.us/j/5876884794?pwd=OUNFRTZKZDNRMm5MWjJjSlhnMXFNUT09\nMeeting ID: 587 688 4794\nPasscode: 871377 \n  \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/perfect-transfer-of-waves/
CATEGORIES:Nanocolloquium Series
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2022/09/Q-Han-Park.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220922T153000
DTEND;TZID=Europe/Moscow:20220922T173000
DTSTAMP:20260905T164629
CREATED:20220921T142400Z
LAST-MODIFIED:20220921T142400Z
UID:6759-1663860600-1663867800@unam.bilkent.edu.tr
SUMMARY:Next Generation Biomonitoring: Implementing Machine Learning for Accurate Metabarcoding with Nanopore MinION
DESCRIPTION:Bilgenur Baloğlu\nUniversity of Southern California \n\nMetabarcoding (identification of the plant\, animal\, and fungal taxa present in an environmental sample) rapidly gains importance in ecology\, food safety\, pest identification\, and disease surveillance. NGS metabarcoding has a compelling advantage over traditional approaches for obtaining data on species distributions\, however\, it is often difficult to detect all the species present in a bulk sample using NGS. This can – in parts – be attributed to shorter read lengths most NGS instruments generate. Moreover\, most NGS platforms are not portable\, making in situ field-based sequencing not feasible. Oxford Nanopore sequencing platforms such as the MinION represent an exception to that and they are also known to provide longer reads albeit limited by rather high error rates (~12-15%). We used a freshwater mock community of 50 Operational Taxonomic Units (OTU) to test the capacity of the Oxford Nanopore MinION coupled with a rolling circle amplification protocol to provide long read metabarcoding results. We established a workflow for DNA metabarcoding of freshwater organisms using the Nanopore MinION sequencing platform. We also propose a new Python pipeline that explores error profiles of nanopore consensus sequences\, mapping accuracy\, and overall community representation of a complex bulk sample. Using our molecular and bioinformatics workflow that implements a machine learning algorithm\, we were able to accurately estimate the diversity of the tested freshwater mock community with an average sequence accuracy of >99% for 1D2 sequencing on the nanopore platform. We could also show that the high error rates associated with long-read single molecule sequencing can be mitigated by using a rolling circle amplification protocol. Future bioassessment programs will tremendously benefit from portable\, highly accurate\, species-level metabarcoding and it appears that we reached a point were cost-effective field-based DNA metabarcoding is possible \n \n  \nAbout Speaker\n  \nBilgenur Baloglu\, Ph.D. is a molecular biologist\, bioinformatics scientist\, and a lecturer\, based in Pasadena\, California. She studied Molecular Biology and Genetics at Istanbul Technical University and earned a Ph.D. at the National University of Singapore in Molecular Ecology\, working on the biological assessment of Singapore’s aquatic ecosystems using Next Generation Sequencing (NGS) and Nanopore sequencing. Her research interests focus on biodiversity monitoring and developing molecular and bioinformatics tools to make DNA sequencing technologies cheaper\, faster\, and more accurate. After completing her postdoctoral studies at the University of Guelph\, Canada\, she led bioinformatics efforts at Sequential Skin\, and moved to Thermo Fisher Scientific\, continuing work in bioinformatics support for NGS. She is also a part-time faculty at the University of Southern California\, teaching a course on genomic analysis using machine learning techniques. Her seminar will focus on the newly developed python based bioinformatics algorithm ASHURE that could improve the nanopore consensus sequence accuracy to >99% for bulk sample metabarcoding. \n  \n\n \n 
URL:https://unam.bilkent.edu.tr/en/event/next-generation-biomonitoring-implementing-machine-learning-for-accurate-metabarcoding-with-nanopore-minion/
CATEGORIES:UNAM Thursday Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220623T153000
DTEND;TZID=Europe/Moscow:20220623T170000
DTSTAMP:20260905T164629
CREATED:20220614T110849Z
LAST-MODIFIED:20220614T111212Z
UID:6659-1655998200-1656003600@unam.bilkent.edu.tr
SUMMARY:Connecting Atomic-scale Impurities to Larger Morphologies
DESCRIPTION:Nadire Nayir\nKaramanoglu Mehmetbey University/The Pennsylvania State University \n\n(Half) van der Waals epitaxy of single-crystal two-dimensional (2D) materials (e.g.\, TMD\, h-BN\, graphene\, group III materials) on substrates are quite challenging and time and source expensive. Therefore\, theoretically characterization of materials is essential to deepen our understanding of the physical and chemical properties of materials\, thus\, ensuring the highest quality in the design and manufacturing processes of materials.\nThis talk will first focus on our multiscale modeling efforts for the synthesis and characterization of 2D materials. I will show some of our own results which have been dedicated to addressing the major challenges encountered in experiments such as (i) unidirectional alignment of 2D domains on a substrate\, (ii) impact of the surface chemistry and crystallographic structure of a substrate on the van der Waals epitaxy\, (iii) unraveling gas-phase chemistry in chemical vapor deposition environment\, (iv) impact of growth conditions on the crystal structure of 2D materials. Additionally\, since technology is developing faster than ever before\, and increasingly depends on constantly advancing basic research and expanding scientific knowledge\, an effective-force field development for multicomponent systems has become crucial to accelerate the knowledge transfer to industry. In the second part\, this talk will also provide an overview of the ReaxFF force fields and multiscale model framework that we developed for 2D materials [4-6]. These potentials offer a computationally cost-effective and versatile research tool for the materials science community to study large-scale simulations of synthesis and defect-\, phase-\, strain-\, and edge engineering of a material of interest\, paving the way for increased application of atomic-level modeling of 2D materials. In turn\, new computational materials and new knowledge will benefit the society by advancing new technologies in energy conversion\, storage\, and other important areas. \n  \n1. N. Nayir\, M. Y. Sengul\, A. L. Costine\, P. Reinke\, S. Rajabpour\, A. Bansal\, A. Kozhakhmetov\, J. Robinson\, J. M. Redwing\, A. van Duin\, “Atomic-scale probing of defect-assisted Ga intercalation through graphene using ReaxFF Molecular Dynamics Simulations”\, Carbon\, 190\, 276–290 (2022)\n2. DR Hickey\, N Nayir\, M Chubarov\, TH Choudhury\, S Bachu\, L Miao\, Y. Wang\, C. Qian\, V. H. Crespi\, J. M. Redwing\, A. C. T. van Duin\, N. Alem “Illuminating Invisible Grain Boundaries in Coalesced Single-Orientation WS2 Monolayer Films”\, Nano Letters 21 (15)\, 6487-6495 (2021)\n3. N. Briggs\, B. Bersch\, Y. Wang\, J. Jiang\, R. J. Koch\, N. Nayir\, K. Wang\, M. Kolmer\, W. Ko\, A. D. L. F. Duran\, S. Subramanian\, C. Dong\, J. Shallenberger\, M. Fu\, Q. Zou\, Y. Chuang\, Z. Gai\, A. Li\, A. Bostwick\, C. Jozwiak\, C. Chang\, E. Rotenberg\, J. Zhu\, A. C. T. van Duin\, V. Crespi\, J. A. Robinson\, “Atomically thin half-van der Waals metals enabled by confinement heteroepitaxy”\, Nature Materials 19 (6)\, 637-643 (2020) 4. N. Nayir\, Y. K. Shin\, Y. Wang\, M. Y. Sengul\, D. Reifsnyder Hickey\, M. Chubarov\, T. H Choudhury\, N. Alem\, J. Redwing\, V. H Crespi\, A. CT van Duin\, “A ReaxFF Force Field for 2D-WS2 and Its Interaction with Sapphire”\, The Journal of Physical Chemistry C 125 (32)\, 17950-17961 (2021) 5. N. Nayir\, Y. Wang\, Y. Ji\, T. Choudhury\, J. M. Redwing\, L.-Q. Chen\, V. H. Crespi\, A. C. T. van Duin\, “Theoretical Modeling of Edge-controlled Growth Kinetics and Structural Engineering of 2D-MoSe2”\, Materials Science and Engineering: B 271\, 115263 (2021)\n6. Y. Xuan\, A. Jain\, S. Zafar\, R. Lotfi\, N. Nayir\, Y. Wang\, T. H. Choudhury\, S. Wright\, J. Feraca\, L. Rosenbaum\, J. M. Redwing\, V. Crespi\, A. C. T. van Duin\, “Multi-scale modeling of gas-phase reactions in metal-organic chemical vapor deposition growth of WSe2”\, Journal of Crystal Growth 527\, 125247 (2019) \n \nAbout The Speaker\nNadire Nayir is currently a postdoctoral research associate of Physics at Karamanoglu Mehmetbey University and a research affiliate of the 2-dimensional Crystal Consortium (2DCC) at The Pennsylvania State University. She received her BS in physics education from Selcuk University in 2009\, and Ph.D. in computational physics from Middle East Technical University in 2018. She worked as a postdoctoral associate of Mechanical Engineering at The Pennsylvania State University for 3 years. \nJoin Zoom Meeting\nhttps://zoom.us/j/5876884794?pwd=OUNFRTZKZDNRMm5MWjJjSlhnMXFNUT09https://zoom.us/j/95581724217 \n\n  \n 
URL:https://unam.bilkent.edu.tr/en/event/connecting-atomic-scale-impurities-to-larger-morphologies/
CATEGORIES:UNAM Thursday Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220615T123000
DTEND;TZID=Europe/Moscow:20220615T133000
DTSTAMP:20260905T164629
CREATED:20220614T062227Z
LAST-MODIFIED:20220614T062629Z
UID:6648-1655296200-1655299800@unam.bilkent.edu.tr
SUMMARY:Probing leaky and guided exciton-polaritons in resonant planar structures
DESCRIPTION:Anton Samusev\nITMO University \n\nPlanar periodic structures such as metasurfaces and photonic crystal slabs strongly coupled to an exciton resonance attract particular attention since they provide vast opportunities for on-demand engineering of the dispersion of guided and leaky polariton resonances. In this regard\, experimental characterization and control of the over modes’ dispersion is of great importance. In this talk\, I will show both what new physical phenomena appear in such systems and how these effects can be directly observed in the experiment. \nIn the first part of the talk\, I will show an experimental approach allowing to retrieve the real [1\, 2] or even full complex [3] dispersion of both leaky and evanescent waves in arbitrary planar structures. The method is based on back focal plane microspectroscopy combined with a solid immersion lens (SIL) separated from the sample by a precisely controlled nanoscale air gap (Otto geometry). Varying the gap allows for extracting both real and imaginary parts of the wavenumber of surface waves propagating in an arbitrary in-plane direction. \nIn the second part of the talk\, I will switch gears to another implication of dispersion engineering in planar structures – the possibility of realization of strong light-matter coupling regime with excitons in transition metal dichalcogenides [4\, 5] and perovskites [6]. I will highlight the nonlinear [4\, 6] and topological [5] properties of exciton polaritons in such systems enabled by finely tuned custom designs of the photonic band structure. \nFinally\, we will discuss how to directly observe and analyze guided exciton-polaritons in planar waveguides either made of a perovskite or based on high-index dielectric slab integrated with transition metal dichalcogenide monolayer. I will show how direct variation of radiative losses via changing the SIL-sample distance in such systems allows for the control of Rabi splitting\, and extraction of exciton-photon coupling strength along with the intrinsic properties of excitons in the sample under study. \nReferences\n1. Pidgayko\, D.\, Sinev\, I.\, Permyakov\, D.\, Sychev\, S.\, Heyroth\, F.\, Rutckaia\, V.\, Schilling J.\, Lavrinenko A.\, Bogdanov A. and Samusev\, A.\, “Direct imaging of isofrequency contours of guided modes in extremely anisotropic all-dielectric metasurface”\, ACS Photonics\, Vol. 6\, No 2\, 510-515\, 2018.\n2. Permyakov\, D. V.\, Sinev\, I. S.\, Sychev\, S. K.\, Gudovskikh\, A. S.\, Bogdanov\, A. A.\, Lavrinenko\, A. V. and Samusev\, A. K.\, “Visualization of isofrequency contours of strongly localized waveguide modes in planar dielectric structures”\, JETP Letters\, vol. 107\, No 1\, 10-14\, 2018.\n3. Permyakov\, D. V.\, Kondratiev\, V. I.\, Pidgayko\, D. A.\, Sinev\, I. S. and Samusev\, A. K.\, “Probing Optical Losses and Dispersion of Fully Guided Waves through Critical Evanescent Coupling”\, JETP Letters\, vol. 113\, No 12\, 780-786\, 2021.\n4. Kravtsov\, V.\, Khestanova\, E.\, Benimetskiy\, F. A.\, Ivanova\, T.\, Samusev\, A. K.\, Sinev\, I. S.\, Pidgayko\, D. A\, Mozharov\, A. M.\, Mukhin\, I. S.\, Lozhkin\, M. S.\, Kapitonov\, Yu. V.\, Brichkin\, A. S.\, Kulakovskii\, V. D.\, Shelykh\, I. A.\, Tartakovskii\, A.I.\, Walker\, P. M.\, Skolnick\, M. S.\, Krizhanovskii \, D. N. and Iorsh\, I. V.\, “Nonlinear polaritons in a monolayer semiconductor coupled to optical bound states in the continuum”\, Light: Science & Applications\, Vol. 9\, No. 1\, 1-8\, 2020.\n5. Li\, M.\, Sinev\, I.\, Benimetskiy\, F.\, Ivanova\, T.\, Khestanova\, E.\, Kiriushechkina\, S.\, Vakulenko\, A.\, Guddala\, S.\, Skolnick\, M.\, Menon\, V. M.\, Krizhanovskii\, D.\, Alù\, A.\, Samusev\, A. and Khanikaev\, A. B.\, “Experimental observation of topological Z2 exciton-polaritons in transition metal dichalcogenide monolayers”\, Nature communications\, Vol. 12\, No 1\, 1-10.\n6. Masharin\, M. A.\, Shahnazaryan\, V. A.\, Benimetsky\, F. A.\, Krizhanovskii\, D. N.\, Shelykh\, I. A.\, Iorsh\, I. V.\, Makarov S.V. and Samusev\, A. K.\, “Polaron-enhanced polariton nonlinearity in lead halide perovskites”\, arXiv preprint arXiv:2201.10265\, 2022 \n  \n  \nAbout The Speaker\nAnton Samusev holds the position of Assistant Professor at School of Physics and Engineering\, ITMO University\, St. Petersburg\, Russia. Since the PhD defense in 2011 at Ioffe Institute\, St. Petersburg\, Russia\, he is leading a scientific group currently comprising 3 Assistant Professors\, 4 Postdocs\, PhD\, MS and BS students. The scientific interests of the group lie at the confluence of the fields of nanooptics\, solid state and laser physics. The research topics include experimental studies of the near- and far-field properties of optically resonant nanoantennas and metasurfaces weakly or strongly coupled to 2D and 3D materials with pronounced excitonic response (transition metal dichalcogenides\, perovskites)\, dispersion engineering of optical surface waves in structured media\, phase change materials\, topological photonics\, photon emission from tunnel junctions\, single-photon emitters and others. Since 2017 Anton lectures the course “Introduction to Experimental Nanophotonics” within the “Nanophotonics and metamaterials” MS program at ITMO University. \nJoin Zoom Meeting\nhttps://zoom.us/j/5876884794?pwd=OUNFRTZKZDNRMm5MWjJjSlhnMXFNUT09https://zoom.us/j/95581724217 \n\n \n 
URL:https://unam.bilkent.edu.tr/en/event/6648/
CATEGORIES:UNAM Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220512T133000
DTEND;TZID=Europe/Moscow:20220512T173000
DTSTAMP:20260905T164629
CREATED:20220427T131814Z
LAST-MODIFIED:20220429T072858Z
UID:6529-1652362200-1652376600@unam.bilkent.edu.tr
SUMMARY:NanoDay 2022
DESCRIPTION:  \n \nNanoDay will take place on Thursday\, May 12th this year as a hybrid event. This annual event held at Bilkent UNAM hosts the best international names in their respective fields and awards the best nano-scale visual through its NanoArt competition.  \nThis year on NanoDay\, we will be hosting two important names—Prof. Oliver Hayden from Technical University of Munich and Prof. Giulia Galla from The University of Chicago. The scientific talks will take place online via Zoom\, on May 12 at 13:30 and 15:30\, respectively. \n\nWe are happy to welcome outside participants to this event. Please register at the link below. Post-registration Zoom information will be sent to the e-mail address you provided: \nhttp://unam.bilkent.edu.tr/nanoday/ \n\nClick the link below to learn about the NanoArt competition and how to participate. The deadline for submissions is Thursday\, May 9 at 23:45. \nunam.bilkent.edu.tr/nanoday/nanoart/  \n@bilkentuniv \nNANODAY 2022 PROGRAM\n12:30 Opening with Poster Session (Unam Conference Hall)\n13:30 Prof.Oliver Hayden (online keynote speech)\n14:30 Flash Poster Presentations (online)\n15:00 Coffee Break\n15:30 Prof.Giulia Galli (online keynote speech)\n16:30 Closing and Award Announcements\n16.45 Open House \n  \nClick for registration!\nhttp://unam.bilkent.edu.tr/nanoday/\n  \n 
URL:https://unam.bilkent.edu.tr/en/event/nanoday-2022/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220415T160000
DTEND;TZID=Europe/Moscow:20220415T170000
DTSTAMP:20260905T164629
CREATED:20220411T070735Z
LAST-MODIFIED:20220413T054859Z
UID:6459-1650038400-1650042000@unam.bilkent.edu.tr
SUMMARY:Logistic Cellular Automata
DESCRIPTION:Seymur Jahangirov\nMSN Graduate Program and UNAM \n\nImagine a system that consists of interconnected cells each having an inner state. The inner state of each cell is changed based on the inner states of a specific subset of cells according to a certain rule. This is a general definition of cellular automata. Now replace those cells with neurons and you get a model of a brain\, replace them with a space grid and you get a model of a fluid flow\, replace them with living cells and you get a model of skin cell of an ocellated lizard. This versatility of cellular automata captured imaginations of great minds including John von Neumann\, John Conway\, Stephen Wolfram and many others. \nIn this seminar\, we will present logistic extensions of cellular automata whereby a single parameter tunes the rate of change. We show several instances of deterministic phase transitions and self-organization in these systems. Finally\, we introduce the operator representation which brings clarity to dynamics of elementary cellular automata and reveals further emergent behavior in its logistic extension. \n \n  \n  \nAbout The Speaker\n  \nDr. Seymur Jahangirov graduated from Nuclear Energy Engineering at Hacettepe University. He received his M.Sc. and Ph.D. from the Material Science and Nanotechnology program at Bilkent UNAM while contributing to seminal works on theoretical prediction of two-dimensional materials. After a postdoc at the Nano-Bio Spectroscopy Group in Spain\, he joined Bilkent UNAM faculty as Assistant Professor. Dr. Jahangirov uses state-of-the-art computational tools based on the Density Functional Theory to discover novel low-dimensional materials with intriguing properties. Dr. Jahangirov is recipient of prestigious awards including Marie Curie IEF award from ERA and TÜBA-GEBİP award from Turkish Academy of Sciences. \nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n \n 
URL:https://unam.bilkent.edu.tr/en/event/logistic-cellular-automata/
CATEGORIES:UNAM PI Seminars
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2022/04/seymur-jahangirov.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220401T160000
DTEND;TZID=Europe/Moscow:20220401T170000
DTSTAMP:20260905T164629
CREATED:20220322T132555Z
LAST-MODIFIED:20220328T121827Z
UID:6398-1648828800-1648832400@unam.bilkent.edu.tr
SUMMARY:3D laser nanoprinting
DESCRIPTION:Prof. Martin Wegener\nKarlsruhe Institute of Technology \n\nTwo-photon based 3D laser printing routinely allows for the making of complex three-dimensional sub-micrometer and nanometer structures and has become a mature\, widespread\, and commercially available technology. After briefly reviewing the basic principle and the state-of-the-art\, I focus on recent progress in my group. This includes replacing two-photon absorption by two-step absorption. This allows for using compact and inexpensive continuous-wave laser diodes instead of femtosecond lasers. \n \n  \n  \nAbout Speaker\n  \nAfter completing his Diplom and PhD in physics at Johann Wolfgang Goethe-Universität Frankfurt (Germany) in 1986 and 1987\, respectively\, he spent two years as a postdoc at AT&T Bell Laboratories in Holmdel (U.S.A.). From 1990-1995 he was professor (C3) at Universität Dortmund (Germany)\, since 1995 he is professor (C4\, later W3) at Institute of Applied Physics of Karlsruhe Institute of Technology (KIT). Since 2001 he has a joint appointment as department head at Institute of Nanotechnology (INT) of KIT\, since 2016 he is one of three directors at INT. From 2001-2014 he was the coordinator of the DFG-Center for Functional Nanostructures (CFN) at KIT. Since 2018 he is spokesperson of the Cluster of Excellence 3D Matter Made to Order. His research interests comprise ultrafast optics\, (extreme) nonlinear optics\, optical laser lithography\, photonic crystals\, optical\, mechanical\, electronic\, and thermodynamic metamaterials\, as well as transformation physics. This research has led to various awards and honors\, among which are the Alfried Krupp von Bohlen und Halbach Research Award 1993\, the Baden-Württemberg Teaching Award 1998\, the DFG Gottfried Wilhelm Leibniz Award 2000\, the European Union René Descartes Prize 2005\, the Baden-Württemberg Research Award 2005\, the Carl Zeiss Research Award 2006\, the Hector Research Award 2008\, the SPIE Prism Award 2014 for the start-up company Nanoscribe GmbH\, the Stifterverband Science Award – Erwin-Schrödinger Prize 2016\, and the Technology Transfer Prize of the German Physical Society (DPG) 2018. In 2014\, 2015\, 2016\, 2017\, 2018\, 2020\, and 2021 Clarivate Analytics listed him as “Highly Cited Researcher” (top 1%). He is Member of Leopoldina\, the German Academy of Sciences (since 2006)\, Member of acatech\, the National Academy of Science and Engineering (since 2019)\, Member of the Hector Fellow Academy (since 2013\, presently also President)\, Fellow of the Max Plack School of Photonics (since 2019)\, Fellow of the Optical Society of America (since 2008)\, and Honorary Professor at Huazhong University of Science & Technology\, Wuhan\, China (since 2014). \nTopic: Nanocolloquium series\nTime: Mar 25\, 2022 04:00 PM Istanbul\nJoin Zoom Meeting\nhttps://zoom.us/j/5876884794?pwd=OUNFRTZKZDNRMm5MWjJjSlhnMXFNUT09\n \n\n \n  \n 
URL:https://unam.bilkent.edu.tr/en/event/3d-laser-nanoprinting/
CATEGORIES:Nanocolloquium Series
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220318T160000
DTEND;TZID=Europe/Moscow:20220318T170000
DTSTAMP:20260905T164629
CREATED:20220316T111506Z
LAST-MODIFIED:20220316T111506Z
UID:6357-1647619200-1647622800@unam.bilkent.edu.tr
SUMMARY:Fibers for optics and structures
DESCRIPTION:Hasan Yılmaz\nMSN Graduate Program and UNAM \n\nOptical fibers are versatile waveguides that have numerous application areas such as telecommunication\, lasers\, biomedical and infrared (IR) optics. Hollow-core optical fibers (HCFs) are microstructured fibers with a hollow-core surrounded by cladding elements that further diversify the applications of fibers in nonlinear optics\, chemical sensing\, plasma generation and many others. The recent simplified cladding structures of HCFs have demonstrated considerable improvement on the optical performances and have the capability of outperforming the solid-core fibers. The selection of fiber’s material plays a crucial role to guide the light in the IR region. Materials such as semiconductors (Si and Ge)\, chalcogenides\, silica-based glasses and even polymers can be used for infrared light transmission by the virtue of the hollow-core and low material absorption. Furthermore\, fibers are used as structural materials within composites by forming the filler part. The body of aircrafts\, sports cars\, yacht and the blades of wind turbines are made by fiber-based composites. The usage of fibers in flexible electronics is another important field that seeks for the electrical conductivity with light-weight approaches. In our laboratory\, Contemporary Fibers Lab (CFL)\, we investigate several types of fibers for light guidance\, composites and electrical conductivity. \nIn this talk\, I will introduce the present research activities in our laboratory by briefly discussing selected present/future projects. The development of optical fibers including the modelling\, fabrication and characterization by multiple materials will cover the first part of the talk. In the second part\, I will focus on the work for improving the mechanical properties of structural fibers by the nanoparticles and flexible conductive fibers. \n \n  \n  \nAbout Speaker\nDr. Mustafa Ordu is a principal investigator in UNAM-National Nanotechnology Research Center and Institute of Materials Science and Nanotechnology at Bilkent University. He received his B.Sc. and M.Sc. degrees in Mechanical Engineering from Istanbul Technical University\, Turkey and Tohoku University\, Japan\, respectively. He completed his Ph.D. studies at Boston University in 2018 on semiconductor-core optical fibers for infrared light guidance. He worked as a postdoctoral researcher on the topics of hollow-core optical fibers and laser micromachining of fibers at XLIM Research Institute\, France before joining Bilkent University. His research interests focus on a variety optical fibers\, particularly for applications in infrared optics. Also\, he has several research projects on glass fibers as structural materials. \nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217
URL:https://unam.bilkent.edu.tr/en/event/fibers-for-optics-and-structures/
CATEGORIES:UNAM PI Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220128T160000
DTEND;TZID=Europe/Moscow:20220128T170000
DTSTAMP:20260905T164629
CREATED:20220126T060052Z
LAST-MODIFIED:20220126T060202Z
UID:6279-1643385600-1643389200@unam.bilkent.edu.tr
SUMMARY:Towards reconfigurable digital complex photonic systems
DESCRIPTION:Hasan Yılmaz\nMSN Graduate Program and UNAM \n\nOptical waves scattered or emitted by materials carry information in temporal (spectral) or spatial domains. Perhaps\, the most prominent example of optical information is an optical image that is created by an optical microscope. With the emergence of information technology\, optical information can be digitized and computationally processed. Computational optical imaging systems typically map spatial and spectral information of light waves to the spatial properties of materials. However\, most optical materials are complex (three-dimensional and opaque): we cannot see inside or behind them. This is because opaque materials’ refractive index is inhomogeneously distributed in space. Incident light waves scatter into random directions upon propagation through opaque materials such as clouds\, mil kor biological tissue\, which scrambles the spatial information. Such a random light scattering process complicates the mapping between scattered light waves and three-dimensional structures. \nIn this talk\, first I will introduce the transmission matrix concept which maps the incident light waves to the scattered light waves through complex optical materials. The main ingredient of this talk will be the ‘transmission-matrix-based operator’ approach. I will show that the transmission matrix not only enables us to transport optical information through a complex material (e.g. a layer of white paint or multimode fiber)\, but it also enables us to modify the relationship between certain incident waves\, scattered waves\, and the configuration of the system. Our ‘transmission-matrix-based operator’ approach provides a general framework for designing and creating a desired input-output relationship of classical and quantum light waves for various applications in imaging\, metrology\, and communication through complex materials. \nFinally\, I will introduce the inverse scattering problem in complex photonic systems such as multiple-scattering materials. Benefiting from the ‘transmission-matrix-based operator’ approach\, I will briefly propose reconfigurable digital complex photonic systems. Such systems will not only be ideal hardware platforms to physically simulate inverse scattering problems but also lead to reconfigurable multimode photonic devices such as dynamic mode converters\, mode demultiplexers\, etc. \n \n  \n  \nAbout Speaker\nHasan Yılmaz is currently an assistant professor at Bilkent University\, the Institute of Materials Science and Nanotechnology. His research interests cover experimental and computational optics and photonics\, light scattering\, optical imaging and spectroscopy\, computational imaging\, wavefront shaping\, spatiotemporal control of light\, complex photonic materials\, mesoscopic physics of light\, statistical optics\, laser physics and random matrix theory. \nPreviously\, he worked as a postdoctoral associate and an associate research scientist at Prof. Hui Cao’s lab\, Yale University\, the Department of Applied Physics. He has received a Ph.D. degree from the University of Twente in the Netherlands for his thesis entitled “Advanced Optical Imaging with Scattering Lenses\,” with Prof. Allard Mosk in 2015. Before this\, he has received a M.Sc. degree in Materials Science and Engineering at Koç University\, where he worked with Prof. Ali Serpengüzel at the Microphotonics Research Laboratory. He has a B.Sc. degree in Physics Engineering from İstanbul Technical University. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/towards-reconfigurable-digital-complex-photonic-systems/
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220121T160000
DTEND;TZID=Europe/Moscow:20220121T170000
DTSTAMP:20260905T164629
CREATED:20220118T113120Z
LAST-MODIFIED:20220118T113120Z
UID:6242-1642780800-1642784400@unam.bilkent.edu.tr
SUMMARY:What can we learn from computational cell models?
DESCRIPTION:Aykut Erbaş\nMSN Graduate Program and UNAM \n\nThere are over 40 million cells in our body. Despite carrying an identical genome\, these cells are specialized into 200 different types to undertake particular biological tasks in various tissues. The main factor determining a cell’s biological identity is the type and amount of cell-specific proteins. In turn\, these cell-specific proteins somewhat determine how\, when\, where\, and which part of genetic information encoded in our DNA will be read to sustain the dynamic complexity of cellular activity. One of the questions that we ask in our research group: can we use minimal computational models to reveal certain parts of this complexity? By considering the kinetics and organizational properties of DNA-binding proteins\, in this talk\, I will present a couple of examples to convince you that computer simulations can be used\, along with biomolecular experiments\, to elucidate the dynamic and organizational properties of the genome. Together we will see that well-designed molecular models can replicate experimental findings and encourage us to reconsider even re-write certain parts of our text-books. \n \n  \n  \nAbout Speaker\nDr. Aykut Erbaş completed his Ph.D. in Physics at Technical University Munich (TUM)\, Germany\, in 2011. His Ph.D. thesis contributed to the understanding of biomolecular mobility\, specifically\, of disordered protein structures. Later he moved to the Chemistry Department at the University of North Carolina – Chapel Hill to research polymer dynamics. Between 2014 and 2018\, Dr. Erbas was a research fellow at the Material Science & Engineering Department at Northwestern University under various centers dedicated to designing bio-inspired energy systems. He also researched the interaction kinetics of biomolecular systems and molecular self-assembly in collaboration with Northwestern Biomolecular Sciences and Chemistry Departments. Dr. Erbas has been actively working on various soft-matter systems in close collaboration with experimental and engineering groups. He is currently interested in the kinetics aspects of protein-DNA interactions and 3d genome organization in his lab. Dr. Erbas has been an assistant professor at UNAM since September 2018 \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/what-can-we-learn-from-computational-cell-models/
CATEGORIES:UNAM PI Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20220107T160000
DTEND;TZID=Europe/Moscow:20220107T170000
DTSTAMP:20260905T164629
CREATED:20220110T065229Z
LAST-MODIFIED:20220110T065229Z
UID:6178-1641571200-1641574800@unam.bilkent.edu.tr
SUMMARY:Fishes\, worms\, and human aging
DESCRIPTION:Ayça Arslan Ergül\nMSN Graduate Program and UNAM \n\nIn this talk I will not focus on one research\, but instead I will try to give glimpses of all the topics that we work on or ideas that we nourish. In this way you may also join or contribute to one of the projects\, if you get interested. Arslan-Ergul lab has been founded in January 2021 in UNAM\, so we are celebrating our first year. Our research interest can be summarized in one word as aging\, in several words as brain aging\, neurodegeneration\, adaptation\, genetics\, and behavior. \n \n  \nAbout Speaker\nAyça Arslan Ergül was graduated from Boğaziçi University\, department of Molecular Biology and Genetics. She did her PhD in Bilkent University Molecular Biology and Genetics department\, on liver cancer and cellular senescence. In Scotland\, Glasgow\, she worked on cell-targeted therapies. For five years\, she worked in Bilkent University UNAM\, on brain aging and new cell formations and taught for the Neuroscience program. She was nominated as Changemaker by Sabancı Foundation for running the Friends\, lets do science project as a volunteer. On her YouTube channel she is teaching molecular biology. She is living with her husband Özgür Ergül and three cats. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/fishes-worms-and-human-aging/
ATTACH;FMTTYPE=image/jpeg:https://unam.bilkent.edu.tr/en/wp-content/uploads/2022/01/asdasd-1.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20211224T160000
DTEND;TZID=Europe/Moscow:20211224T170000
DTSTAMP:20260905T164629
CREATED:20211221T101709Z
LAST-MODIFIED:20211221T101709Z
UID:6149-1640361600-1640365200@unam.bilkent.edu.tr
SUMMARY:Control of Static Electricity By Light and Polymer Mechanochemistry
DESCRIPTION:Bilge Baytekin\nMSN Graduate Program and UNAM \n\nThe mechanism of static electricity generation and mitigation on insulator surfaces upon rubbing/contact is one of the few scientific questions that have remained unanswered for millennia. Static charging (tribocharging) of insulators is not just a scientific mystery – it is also a significant problem\, especially critical for various industries\, e.g.\, polymer\, pharmaceuticals\, electronics\, and space. Several methods of tribocharge mitigation exist in practice; however\, none can reach the practicality of using light in the process. Here I will present light-controlled mitigation of triboelectric charges on common polymers. The tribocharged polymers are discharged upon illumination with appropriate wavelengths of light in the presence of a mediator organic dye. Our method provides spatial and temporal control on mitigation of static charges on common polymer surfaces by a mechanism that involves photoexcitation of organic dyes\, allowing an additional ‘wavelength control’. \nMechanochemistry of organics and polymers has long been studied\, but the link between the static electricity of polymers and mechanochemistry – despite its obvious presence – is still overlooked. In this talk\, I present this chemical link and show how the mechanochemical pathways and the generated mechanospecies can be used to make composites in a green chemistry way. \n \nKonuşmacı hakkında\nBilge Baytekin is an Assistant Professor in the Chemistry Department of Bilkent University. She received her Ph.D. from Freie Universitat Berlin and pursued her postdoctoral studies (2009-2014) at Northwestern University and Harvard University. Her research interests include static electricity\, organic and polymer mechanochemistry\, smart materials\, and soft robotics. She is the recipient of the Loreal Unesco for Women in Science\, TÜBA GEBIP\, BAGEP\, Mustafa Parlar Vakfı\, TÜBİTAK Teşvik Awards\, and 2019 Rising Star Award from the Electrostatics Society of America (ESA). She likes poetry and tea. She has a lovely daughter. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/control-of-static-electricity-by-light-and-polymer-mechanochemistry/
CATEGORIES:UNAM PI Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20211217T160000
DTEND;TZID=Europe/Moscow:20211217T170000
DTSTAMP:20260905T164629
CREATED:20211213T074324Z
LAST-MODIFIED:20211213T074324Z
UID:6119-1639756800-1639760400@unam.bilkent.edu.tr
SUMMARY:Plasmon-Enhanced Light-Matter Interactions at the Nanoscale
DESCRIPTION:Wonmi Ahn\nMSN Graduate Program and UNAM \n\nNoble metal nanoparticles supporting collective oscillations of conduction electrons\, i.e.\, surface plasmon resonances\, exhibit excellent light-focusing ability and high spectral sensitivity to changes in the surrounding medium. These capabilities explain the increasing role of plasmonic nanomaterials in nanoimaging\, sensing\, energy\, and biomedical applications. However\, high dissipative losses in plasmonic metals and the lack of mass-production methods have been severe bottlenecks preventing their practical use in many applications. In this seminar\, I will show some of the approaches we have taken in the past to overcome the challenges in the field of plasmonics\, which have eventually led to the development of new classes of optoplasmonic materials and bottom-up nanofabrication methods. I will also show how we exploited the dissipative plasmonic loss\, which has been a significant drawback\, to generate hot carriers that drive chemical reactions. Beyond plasmonics\, I will also discuss light-matter interactions in the strong coupling regime (for both excitonic and vibrational absorbers)\, which have great potential to modify materials’ physical and chemical properties by light. The talk will conclude with future research directions that may spark interdisciplinary collaboration within the UNAM community. \n \nKonuşmacı hakkında\nWonmi Ahn obtained a Bachelor of Engineering degree in Chemical Engineering from Soongsil University in South Korea and a Ph.D. degree in Materials Science and Engineering from the University of Utah in the United States. She undertook postdoctoral research at Boston University in the United States and continued her research at the U.S. Naval Research Laboratory as a National Research Council postdoctoral fellow of the United States and later worked as a Materials Research Scientist. She has published more than 21 research papers\, including one U.S. Patent on a nanofabrication method based on electroless metal plating technique. Her research interests include light-matter interactions in the strong coupling regime\, plasmonic nanomaterials for photocatalysis\, plasmon-enhanced photoelectrochemistry\, and photonic-plasmonic hybrid materials for sensing applications. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/plasmon-enhanced-light-matter-interactions-at-the-nanoscale/
CATEGORIES:UNAM PI Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20211119T160000
DTEND;TZID=Europe/Moscow:20211119T170000
DTSTAMP:20260905T164629
CREATED:20211115T112644Z
LAST-MODIFIED:20211115T122531Z
UID:6030-1637337600-1637341200@unam.bilkent.edu.tr
SUMMARY:Exploring electronic correlations in low dimensional materials
DESCRIPTION:T. SERKAN KASIRGA\nMSN Graduate Program and UNAM \n\nStrong electronic correlations among various degrees of freedoms in solids result in the emergence of fascinating phenomena. To name a few we can list metal-insulator transitions\, charge density wave transitions and superconductivity. However\, these phenomena are notoriously difficult to study experimentally as they are typically associated with phase transitions that are extremely sensitive to the defects and impurities in the materials. In this talk\, I will present our efforts to understand the phase transitions in some exemplary materials and present a journey from materials synthesis to characterization of the properties via electrical\, mechanical and optical methods. First\, I will talk about how we synthesize the materials in a unique setup that allows real-time optical observation of the crystal synthesis. Then\, I will talk about the effect of thickness on the phase transitions and how we use light to measure certain properties of the correlated materials. Overall\, I will try to give a general perspective on our efforts and conclude with open questions. \n \nAbout The Speaker\nDr. Kasırga got his bachelor’s degree from Bilkent University in physics in 2009. Then\, he moved to the University of Washington\, Seattle for his Ph.D. in physics. After completing his Ph.D. in 2013\, he moved to Bilkent University as a principal investigator at the National Nanotechnology Research Center (UNAM) and established a research program. Since 2015\, he has been serving as the associate director of UNAM and since 2016 he is co-affiliated with the department of physics. His research has appeared in prestigious journals in his field such as Nature\, Nature Nanotechnology\, Nano Letters and 2D Materials. For these research efforts\, the Academy of Science awarded him the Young Scientist Award (GEBİP) in 2021. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/exploring-electronic-correlations-in-low-dimensional-materials/
CATEGORIES:UNAM PI Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20211112T160000
DTEND;TZID=Europe/Moscow:20211112T170000
DTSTAMP:20260905T164629
CREATED:20211115T122209Z
LAST-MODIFIED:20211115T132854Z
UID:6052-1636732800-1636736400@unam.bilkent.edu.tr
SUMMARY:How does self-organization reduce entropy?
DESCRIPTION:ÖMER İLDAY\nMSN Graduate Program and UNAM \n\nSelf-organization is the spontaneous emergence of an ordered state. Despite its ubiquity\, how self-organization reduces entropy was never clarified. In this talk\, we present a new theoretical framework\, whereby we decompose a self-organized system into two parts\, one that gets ordered and another that reduces the entropy of the former by mutual information generated through a feedback process. We show that the combined system simply evolves to higher total entropy\, which inadvertently reduces the entropy of the organized part. \nSelf-organization is notoriously difficult to direct to a specific pattern. Our new framework suggests a route. We need to ensure that the desired pattern has higher feedback gain than the competing ones. We also introduce stimulated symmetry breaking as means to reshape the feedback gain landscape. As a proof of concept\, we experimentally demonstrate directing a self-organization process\, namely\, nonlinear laser lithography\, to create all 2D Bravais lattices. \n \n  \nAbout The Speaker\nDr. F. Ömer Ilday studied theoretical physics at Boğaziçi University\, Istanbul\, Turkey\, graduating valedictorian in 1998. He took his Ph.D. in applied physics from Cornell University\, USA\, in 2003. He worked at MIT from 2003 to 2006. In 2006\, he joined Bilkent University as a faculty member. He was awarded the European Research Council’s prestigious Consolidator Grant in 2013\, the first ERC grant on basic science in Turkey\, and the ERC Proof of Concept Grant in 2021. He has published ten articles in Nature\, Nature Photonics\, Nature Physics\, and Nature Communications. His contributions to science have been generously recognized through the Findlay Award\, TÜBA-GEBIP Award\, Teşvik Award (TÜBİTAK)\, Engin Arık Science Award from the Turkish Physical Society\, and the top award in science in Turkey\, the Science Award of TÜBİTAK. He has been elected as a member of the Science Academy of Turkey and Academia Europaea. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217
URL:https://unam.bilkent.edu.tr/en/event/how-does-self-organization-reduce-entropy/
CATEGORIES:UNAM PI Seminars
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Moscow:20211105T160000
DTEND;TZID=Europe/Moscow:20211105T170000
DTSTAMP:20260905T164629
CREATED:20211115T132640Z
LAST-MODIFIED:20211115T134414Z
UID:6096-1636128000-1636131600@unam.bilkent.edu.tr
SUMMARY:The birth\, life\, and death of dissipative colloidal crystals
DESCRIPTION:SERİM İLDAY\nMSN Graduate Program and UNAM \n\nIn 1994 Erwin Schrödinger published an inspiring book titled “What Is Life? The Physical Aspect of the Living Cell.” Using only physical and mathematical reasoning\, he concluded that the information necessary to replicate the living is most likely stored in an aperiodic crystal before the discovery of DNA. This provoked -at the time- the radical idea that\, despite its complexity\, life can be described by mathematical rules governing physical processes. Since then\, the idea has been explored theoretically with simple models such as cellular automata\, originally introduced by von Neumann\, or with highly complex biochemical experiments. There is a lack of the experimental counterpart of the simple theoretical models. \nSeveral years ago\, we designed the simplest experimental system that can still manifest the key characteristics of living organisms. Our system does not involve any biochemical interactions but only purely physical effects. We showed that artificial atoms (strongly Brownian polystyrene spheres sustained in water) can form autocatalytic\, dynamic adaptive crystals with a garden variety of patterns (Nature Commun. 2017). We further formulated the physical processes of their emergence and uncovered universality (Nature Phys. 2020). Understanding the rules behind their “birth” and “life” motivated us to study their “death\,” which led to the discovery that one-time-only energy delivery may be enough to form connections between initially uncorrelated and spatially distant atoms (JPCM 2021). In this talk\, I will walk you through this journey and explore the possibility of approaching life from first principles. \n \nAbout The Speaker\nSerim’s research is at the intersection of soft condensed matter\, active matter\, self-assembly\, complexity\, nonequilibrium statistical physics\, and nonlinear dynamics. She is an Assistant Professor at the Institute of Materials Science and Nanotechnology & National Nanotechnology Research Center (UNAM) at Bilkent University\, Ankara\, Turkey\, which she joined in December 2017. Before that\, she was a postdoctoral researcher and later a research scientist at the Physics Department at Bilkent University. She received her Ph.D. from Middle East Technical University\, Ankara\, Turkey\, in 2014. She is the recipient of prestigious awards and recognitions\, including the L’Oreal-UNESCO For Women in Science (FWIS) in 2018 and European Research Council Starting Grant (ERC-StG) in 2019. She has been a Fellow of the Young Academy of Europe (YAE) since 2020 and was elected as an ‘Emerging Leader’ in condensed matter physics by the Editorial Board of the Journal of Physics: Condensed Matter the same year. Her research has been published in renowned journals\, including Nature Physics\, Nature Photonics\, Nature Communications\, and Nano Letters. \n\nJoin Zoom Meeting\nhttps://zoom.us/j/95581724217 \n\n 
URL:https://unam.bilkent.edu.tr/en/event/the-birth-life-and-death-of-dissipative-colloidal-crystals/
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