1. Department of Optoelectronic Science, Harbin Institute of Technology at Weihai, Weihai 264209, China
2. School of Marine Science and Technology, Harbin Institute of Technology at Weihai, Weihai 264209, China
3. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
4. School of Materials Science and Engineering, Harbin Institute of Technology at Weihai, Weihai 264209, China
5. Department of Physics, Southeast University, Nanjing 211189, China