1National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
2Synergetic
Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
3State
Key Laboratory on Integrated Optoelectronics and College of Electronic
Science and Engineering, Jilin University, Changchun 130012, China
4Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergistic Innovation Center for Advanced Materials, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P.R. China
5Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, United States