报告题目：Floquet higher order topological insulators with anomalous dynamical polarization

报告人：黄飚 副教授 (中国科学院大学卡弗里理论科学研究所) 

报告时间：2021 年 12 月 3 日（周五）15：30

报告地点：线上报告（腾讯会议：750 658 662）

报告摘要：

      In the past several decades, crystalline polarization theory has been a corner stone in solid state physics, giving rise to various topological invariants including that for the prototype of Z2 time-reversal symmetric topological insulators found in 2004. In this talk, I will show how to generalize it to a strongly driven dynamical situation transcending conventional static scenarios. Such a generalization qualitatively expands the study of higher-order topological insulators into the "anomalous Floquet" regime, where all bands are trivial while the spacetime-dependent topology results in dynamical corner modes. The new mathematical framework and physical pictures found in anomalous dynamical polarization theory open the door to investigating topological invariants in a wide class of strongly driven system. 

参考文献：

[1] Biao Huang and W. Vincent Liu, "Floquet Higher-Order Topological Insulators with Anomalous Dynamical Polarization", Phys. Rev. Lett. 124, 216601 (2020). 

报告人简介：

      2009: Undergrad at Beijing Normal University. 2016: PhD at Ohio State University. 2016-2019: Postdoc, University of Pittsburgh. 2019-2021: Guest Scientist, Max Planck Institute for the Physics of Complex Systems, Dresden. 2021-Now: KITS, UCAS, Beijing. 

Research interest: Cold atom theories, especially for highly non-equilibrium phases of matter, i.e. time crystals, anomalous Floquet insulators, localization, and thermalization issues.