1. School of Optoelectronic Science and Engineering of UESTC, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
2. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
3. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, People’s Republic of China
4. Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan, ROC
5. Department of Physics, National Sun Yet-Sun University, Kaohsiung 80424, Taiwan, ROC