Lorentz skew scattering mechanism in nonlinear magneto-transport

报告人

Prof. Shengyuan A. Yang (杨声远)

The Hong Kong Polytechnic University

时间

2026年6月11日（星期四）上午10：00

地点

物质科学教研楼B902会议室

报告摘要

Nonlinear transport phenomena have been a focus of recent research. They unveil material properties that are inaccessible via linear responses, and they hold great potential for nonlinear electronics applications. Here, we unveil a new mechanism in nonlinear magneto-transport from cooperative action of Lorentz force and skew scattering. The significance of this Lorentz skew scattering mechanism lies in that it dominates both longitudinal and transverse nonlinear transport in highly conductive systems, and it exhibits a scaling behavior distinct from all known mechanisms. At low temperature, it shows a cubic scaling in linear conductivity, whereas the scaling becomes quartic at elevated temperature when phonon scattering kicks in. Applying our developed microscopic theory to surface transport in topological crystalline insulator SnTe and bulk transport in Weyl semimetals leads to significant results, suggesting a new route to achieve giant transport nonreciprocity in high-mobility materials with topological band features. Our theory has been confirmed in two recent experiments.