1. State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology (SIMIT), Chinese Academy of Sciences, Shanghai 200050, China
2. State Key Laboratory of Surface Physics, Department of Physics, and Advanced Materials Laboratory, Fudan University, Shanghai 200433, China
3. CAS Center for Excellence in Superconducting Eletronics (CENSE), Shanghai 200050, China
4. CAS-Shanghai Science Research Center, Shanghai 201203, China