Affiliation: | 1. Department of Material Science , Sichuan University , Chengdu 610064, China;2. International Center for Materials Physics , Chinese Academy of Sciences , Shengyang 110016, China zhengwc1@163.com;4. Department of Material Science , Sichuan University , Chengdu 610064, China;5. Department of Optics and Electronics , Chengdu University of Information Technology , Chengdu 610225, China |