1. Department of Physics, Guangdong Technion─Israel Institute of Technology, 241 Daxue Road, Shantou 515063, Guangdong, China
2. Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion, Guangdong Technion─Israel Institute of Technology, Shantou 515063, Guangdong, China
3. Technion─Israel Institute of Technology, Haifa 32000, Israel