National Laboratory for Superconductivity;
Beijing National Laboratory for Condensed Matter Physics;
Institute of Physics;
Chinese Academy of Sciences;
Beijing 100190;
Beijing National Laboratory for Condensed Matter Physics;
Institute of Physics;
Chinese Academy of Sciences;
Beijing 100190;
Key Laboratory for Optics;
Beijing National Laboratory for Condensed Matter Physics;
Institute of Physics;
Chinese Academy of Sciences;
Beijing 100190;
Technical Institute of Physics and Chemistry;
Chinese Academy of Sciences;
Beijing 100190;