1. National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresDepartment of PhysicsNanjing University Nanjing 210093 China
2. National Synchrotron Radiation LaboratoryUniversity of Science and Technology of China Hefei 230029 China
3. Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of Sciences Beijing 100190 China
4. Westlake Institute for Advanced Study Hangzhou 310012 China
5. Nanophotonics Research DivisionCAS Center for Excellence in NanoscienceNational Center for Nanoscience and Technology Beijing 100190 China
6. National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresSchool of Electronic Science and EngineeringNanjing University Nanjing 210093 China