1. Wuhan National Laboratory for Optoelectronics (WNLO); Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 Hubei P. R. China
2. School of Optical and Electronic Information; Huazhong University of Science and Technology; 1037 Luoyu Road Wuha 430074 Hubei P. R. China
3. Wuhan National High Magnetic Field Center; Huazhong University of Science and Technology; 1037 Luoyu Road Wuhan 430074 Hubei P. R. China