1. Hefei National Laboratory for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information & Quantum PhysicsUniversity of Science and Technology of China Hefei Anhui 230026 China
2. Division of Physics and Applied PhysicsSchool of Physical and Mathematical SciencesNanyang Technological University Singapore 637371 Singapore
3. USTC Center for Micro‐ and Nanoscale Research and FabricationUniversity of Science and Technology of China Hefei Anhui 230026 China
4. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Optoelectronic EngineeringShenzhen University Shenzhen 518060 China
5. Department of PhysicsUniversity of Science & Technology of China Hefei Anhui 230027 China
6. National Synchrotron Radiation LaboratoryUniversity of Science & Technology of China Hefei Anhui 230027 China