报告题目：“Marrying” light to matter in solid state cavity quantum electrodynamics

报 告 人：Xiaoze Liu, University of California, Berkeley

报告时间：2018-05-30 10:30

报告地点：理科楼C302报告厅

报告摘要：Light and matter are distinct physical entities that can strongly interact with each other. In the scheme of cavity quantum electrodynamics (CQED), light and matter can be “married” to demonstrate unprecedented phenomena by taking advantages of both constituents. The solid state platform provides a convenient and efficient testbed to explore the underlying physics and optoelectronic applications in CQED. In this seminar, I will first introduce new hybrid quasiparticles by the “marriage” of light (i. e., photon) and matter (i. e., exciton) in the strong coupling regime of solid state CQED. The hybrid quasiparticles called exciton-polaritons take advantages of excitons and photons, leading to interesting physics and applications such as high-temperature Bose-Einstein condensation, superfluidity, photon blockade and inversionless lasers. Specifically, I will discuss the formation and coherent control of exciton-polaritons in an optical cavity embedded with two-dimensional (2D) semiconductors. As one typical example of the emerging materials, 2D semiconductors show unique excitonic properties due to large quantum confinement. These properties overcome limitations of conventional quantum well systems, and are inherited to the 2D exciton polaritons for table-top demonstration of profound quantum phenomena. Following this, I will also present some of our recent progress on the perovskite semiconductors with Rydberg excitons in CQED. The Rydberg exciton series in perovskites demonstrate large oscillator strengths and thus can be strongly coupled to cavity photons. The observation of Rydberg exciton polaritons and its condensation indicates great applications for quantum optics and energy-efficient devices. Finally, I will briefly talk about some future ideas (long-term and short terms) on the quantum study of these excitonic materials in CQED and efficient optoelectronic applications.