Dynamical Quantum Anomalous Hall Effect in Strong Optical Fields
  • 来源:深圳大学物理与能源学院
  • 发布者:学院办公室
  • 发布时间:2017-06-05 16:04:57
  • 浏览次数:1278
  • 报告主题:Dynamical Quantum Anomalous Hall Effect in Strong    Optical Fields


    主讲嘉宾: Prof. Wang-Kong TseUniversity of Alabama

    时  间:201766日(周 10:40-11:20

    地  点:南区物理光电楼物理与能源学院N1206会议室




           Topological insulators are characterized by the quantum anomalous Hall effect on the topological surface states under time-reversal symmetry breaking. While this effect has been recently observed in a magneto-optical setup upon illumination of weak linearly polarized light, the influence of intense optical field remains largely unexplored. In this talk, I will first review the quantum anomalous Hall effect realized in topological insulator surface states under a weak optical field. Then I will discuss our recent progress in generalizing the theory of quantum anomalous Hall effect from the linear response to the strong optical field regime. For low frequencies where the one-half Hall quantization breaks down under intense optical field,our results reveal a strong nonlinear dependence of the dynamical Hall conductivity on the incident optical field, triggered by the transitions between Floquet subbands.




            Prof. Wang-Kong Tse is a theoretical condensed matter physicist and is currently assistant professor in the Department of Physics and Astronomy and the Center for Materials for Information Technology at the University of Alabama. After receiving his Ph.D. from the University of Maryland in 2008, he performed postdoctoral research at the University of Texas at Austin and was then a Director’s Postdoctoral Fellow at the Los Alamos National Laboratory. His research is centered on the transport, optical, and electronic many-body effects in low-dimensional quantum materials and confined nanostructures including two-dimensional atomically thin materials and topological systems.