MIT

摘要：
Due to the recent discovery of topological insulators, it has been recognized that topologyis indispensable in distinguishing phases of matter.Similarly, new optical material systems are being discovered with non-trivial topologiesof their wave-functionsin the momentum space, whoseinterfaces support novel states of light with unprecedented properties such as the robustness to disorder and fabrication imperfections.
In this talk, I will show the photonic (Bosonic) analogues of 2D quantum anomalous Hall effects, 3D topological Weyl and Dirac semimetals and topological crystalline insulators. Specifically, I will present our recent experimentson large Chern numbers (up to four), observation of Weyl points in gyroidsand prediction of the photonic single-Dirac-cone surface state with a Z2 index.These new degrees of freedom in band topologies promise wide exciting opportunitiesin both fundamental physics and technological outcomes.

报告人简介：
Ling Lu is currently a research scientist in the Physics Department of Massachusetts Institute of Technology working with Prof. Marin Soljačić and John Joannopoulos. He obtained his bachelor in Physics in 2003 from FudanUniversity in Shanghai, China. He did his Masters in Physics and Electrical Engineering and Ph.D.in Electrical Engineering in 2010,all at University of Southern California in Los Angeles. His thesis work, advised by Prof. John O’Brien, was on photonic crystal nanocavity lasers. Collaborating with Prof. Liang Fu, his current research focuses on topological photonics.

报告邀请人：翁红明 副研究员 （82649941）
联系人：刘青梅 （82649414）