1. Low Temperature Physics Laboratory, College of Physics, Chongqing University, Chongqing401331, China
2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, 585 Heshuo Road, Shanghai201899, P. R. China
3. Center of Quantum Materials and Devices, College of Physics, Chongqing University, Chongqing401331, P. R. China
4. College of Chemistry and Chemical Engineering, Chongqing University, Chongqing401331, China