{"id":7076,"date":"2022-11-21T14:29:49","date_gmt":"2022-11-21T11:29:49","guid":{"rendered":"https:\/\/unam.bilkent.edu.tr\/en\/?post_type=tribe_events&p=7076"},"modified":"2023-04-03T15:10:46","modified_gmt":"2023-04-03T12:10:46","slug":"novel-electronic-properties-of-quantum-critical-dirac-plasma","status":"publish","type":"tribe_events","link":"https:\/\/unam.bilkent.edu.tr\/en\/event\/novel-electronic-properties-of-quantum-critical-dirac-plasma\/","title":{"rendered":"Novel electronic properties of quantum critical Dirac plasma"},"content":{"rendered":"
Alexey Berdyugin<\/h5>\n

The National University of Singapore<\/p>\n

\n

The most recognizable feature of graphene\u2019s 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\u2019ll 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\u2019ll 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.<\/p>\n

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About Speaker<\/strong><\/h3>\n

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Prof 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.<\/p>\n

UNAM Conference Hall,<\/strong><\/p>\n

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Alexey Berdyugin The National University of Singapore The most recognizable feature of graphene\u2019s electronic spectrum is its Dirac point around which interesting phenomena tend to cluster. 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