1. Anhui Province Key Laboratory of Intelligent Computing and Applications, Anhui Province Key Laboratory of Pollutant Sensitive Materials and Environmental Remediation, Anhui Province Industrial Generic Technology Research Center for Alumics Materials, School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, P.R. China
2. Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, P.R. China
3. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, P.R. China