【报告题目】Theoretical study of hydrodynamic viscosity in disordered Dirac electrons
【报 告 人】陈微微博士,西湖大学
【报告时间】2023年2月23日（周四）下午4:00;
【报告地点】科技楼29-414
【报告摘要】This presentation provides an overview of the research I have done about hydrodynamic viscosity in Dirac electron systems. Hydrodynamic phenomena in solids, which provide a window to peek into the collective motion of electrons, have attracted the great attention of physicists from diverse backgrounds. So far the discussion on the fate of hydrodynamic electronics in the presence of disorder scattering is largely phenomenological, and a systematical study is still lacking. Here we investigate the hydrodynamic properties of Dirac electron fluid in graphene from a microscopic viewpoint based on the linear response theory. We investigate the shear and Hall viscosity of graphene under various influences, including disorder, magnetic field, and dynamic deformation. We present strong evidence that, due to frequent electron-hole collisions, the shear viscosity can be enhanced by electron-disorder scattering, which is in sharp contrast to the common sense of classical liquids. Therefore, our work demonstrates the exotic landscape of hydrodynamic electronics in graphene and presents experimentally relevant responses to quantify the effects of electronic viscosity.
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