1. School of Science, and Ministry of Industry and Information Technology Key Lab of Micro‐Nano Optoelectronic Information System Harbin Institute of Technology Shenzhen Guangdong 518055 P. R. China
2. School of Materials Science and Engineering Harbin Institute of Technology Shenzhen Guangdong 518055 P. R. China
3. Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 P. R. China
4. Department of Physics and Texas Center for Superconductivity at University of Houston (TcSUH) University of Houston Houston TX 77204 USA