Institution: | (1) Department of Physics, Fudan University, Shanghai, 200433, China;(2) Max-Planck-lnstitut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany;(3) National Laboratory of Infrared Physics, Academia Sinica and Department of Physics, Fudan University, Shanghai, 200433, China;(4) Office of the Chancellor/Departments of Chemistry and Physics & Astronomy, University of Wisconsin-Stevens Point, Stevens Point, Wisconsin, 54481-3897 |