1. Hunan Key Laboratory of Nanophotonics and Devices, School of Physics, Central South University 1 , Changsha 410083, People’s Republic of China
2. Physical Sciences and Engineering Division, King Abdullah University of Science and Technology 2 , Thuwal 23955-6900, Saudi Arabia
3. Department of Physics, College of Sciences, National University of Defense Technology 3 , Changsha 410073, People’s Republic of China
4. School of Microelectronics, Southern University of Science and Technology 4 , Shenzhen 518055, People’s Republic of China
5. Institute of Micro/Nano Materials and Devices, Ningbo University of Technology 5 , Ningbo 315211, People’s Republic of China
6. College of Energy and Power Engineering, Changsha University of Science and Technology 6 , Changsha 410114, People’s Republic of China