1. State Key Laboratory of Silicon and Advanced Semiconductor Materials & School of Materials Science and Engineering, Zhejiang University, Hangzhou 310030, P. R. China
2. State Key Laboratory of Silicon and Advanced Semiconductor Materials & Department of Physics, Zhejiang University, Hangzhou 310030, P. R. China
3. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China