Date: November 4
Time: 16:20 - 17:50 （5限）
Room: E1-215 （電気系E1棟215号室）
Speaker: Prof. Junichiro Kono (Rice Uniersity (Guest Professor of Osaka Univ.))
Title: Terahertz Cavity Quantum Electrodynamics
Nonperturbative coupling of light with condensed matter in an optical cavity is expected to reveal a host of coherent many-body phenomena and states. In addition, strong coherent light-matter interaction in a solid-state environment is of great interest to emerging quantum-based technologies. However, creating a system that combines a long electronic coherence time, a large dipole moment, and a high cavity quality (Q) factor has been a challenging goal. After reviewing previous studies on cavity quantum electrodynamics in solids, this talk will describe our recent observation of collective ultrastrong light-matter coupling in an ultrahigh-mobility two-dimensional electron gas (2DEG) in a high-Q terahertz photonic-crystal cavity in a quantizing magnetic field, demonstrating a cooperativity of 360 .
 Q. Zhang, M. Lou, X. Li, J. L. Reno, W. Pan, J. D. Watson, M. J. Manfra, and J. Kono, “Collective Non-perturbative Coupling of 2D Electrons with High-Quality-Factor Terahertz Cavity Photons,” Nature Physics, published online on August 22, 2016. See also arXiv:1604.08297.