1. State
Key Laboratory of Silicon Materials, School of Materials Science and
Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, P. R. China
2. Hefei
National Laboratory for Physical Sciences at the Microscale, Key Laboratory
of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences,
Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China