陆凌 研究员
中科院物理所
地点：唐仲英楼 B501
时间：2018-02-02 10:00
Due to the recent discovery of topological insulators, it has been recognized that topology is indispensable in distinguishing phases of matter. Similarly, new optical material systems are being discovered with non-trivial topologies of their global wave-functions in the momentum space, whose interfaces support novel states of light with ideal transport properties such as the robustness to large disorder or fabrication imperfections.In this talk, I will introduce the underlining principles and show our experimental realizations and theoretical predictions of 2D and 3D photonic crystals with topologically protected edge and surface states. Specifically, I will discuss single and multimode one-way edge states and fiber modes protected by first and second Chern numbers, the observation of ideal Weyl points and nodal chains and their related consequences. This research can be extended to phonons, plasmons and other bosons. These new degrees of freedom in bosonic band topologies promise wide exciting opportunities in both fundamental physics and technological outcomes.
Ling Lu is a professor in the Institute of Physics of Chinese Academy of Sciences in Beijing China. He obtained his bachelor in Physics in 2003 from Fudan University in Shanghai, China. He got his Ph.D. in Electrical Engineering in 2010 at University of Southern California in Los Angeles. His experimental thesis work, advised by Prof. John O’Brien, was on photonic crystal nanocavity lasers. He was a postdoc and later a research scientist in the Physics Department of Massachusetts Institute of Technology, where he worked with Prof. Marin Soljačić and John Joannopoulos and collaborated with Prof. Liang Fu. His current research focuses on topological photonics.