【报告题目】Magnetoresistance in noncentrosymmetric two-dimensional systems (1-4)
【报告人】Prof.Reza Asgari, The University of New South Wales, Australia & Institute for Research in Fundamental Sciences, Iran
【报告时间】Sep.13, 18, 20, 27, 14:00-16:00
【报告地点】29-414（Sep.13）；20-21幢连廊党员之家（Sep.18, 20, 27）
【报告摘要】In this talk, we explore the issue of weak- field magnetoresistance in two-dimensional multivalley systems with broken inversion symmetry. We provide an exact solution to the Boltzmann equation and demonstrate that the inclusion of in-scattering terms in the collision integral can change the sign of the magnetoresistance in the high-density regime. With an initial valley polarization, we also predict an orbital magnetic moment-induced intrinsic contribution to Hall conductivity in the time-reversal-broken situation, which is consistently negative and, in contrast to the anomalous Hall term, it does not depend on the polarization sign. Depending on which valley has the excess charge, our calculations show that a completely distinct behavior is exhibited in the magnetoresistance which can be considered as a valley-polarization probe in the experiment.
【邀请人】高先龙教授
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