报告题目：Photonic properties in quantum-classical hybrid systems
摘要：Recently, research on photonic properties in quantum-classical hybrid systems becomes quite interesting both in fundamental research and application. In the presentation, I will introduce a couple of examples to show how such hybrid systems break our traditional knowledge.
At first, the magneto-optical effect breaks time-reversal symmetry, a unique property that makes it indispensable in nonreciprocal optics and topological photonics. Unfortunately, all natural materials have a rather weak magneto-optical response in the optical frequency range, posing a significant challenge to the practical application of many emerging device concepts. Here we theoretically propose a composite material system that exhibits an intrinsic magneto-optical response orders of magnitude stronger than most magneto-optical materials used today. This is achieved by tailoring the resonant interplay between the quantum electrodynamics of electronic transitions in two-level systems and the classical electromagnetic response of local plasmon resonance.
Second, superradiance is a phenomenon due to collective spontaneous radiation in a system with multiple emitters and it only emerges if the emitter distance is much less than the wavelength in free space. However, such a subwavelength condition may be broken if putting these emitters in specific photonic crystals.
报告人简介：Lei Ying is a postdoctoral research associate in Electrical & Computer Engineering University of Wisconsin-Madison. He received B. S. degree in physics from Lanzhou University and Ph.D. degree in Electrical Engineering from Arizona State University. His research interests are optics including nanophotonics, quantum optics, plasmonics and single photon detection, solid state physics and condensed matter physics, including two-dimensional electron systems (graphene), Floquet systems, quantum Hall effects, nanoscale physics, quantum transport, localization, nonlinear phenomena in nanosystems, such as optomechanical, semiconductor superlattice, and nanowire systems. He won the Research Assistant Grants of Arizona State University in 2011-2016. He published more than 20 papers including Physical Review series, nature communication etc.