1. Wuhan National Laboratory for Optoelectronics (WNLO)
and School of Optical and Electronic information, Huazhong University of Science and Technology, Wuhan 430074, People’s Republic of China
2. Department of Materials Science and Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 8523, People’s Republic of China
3. The State Key Lab for Refractory
and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, People’s Republic of China