1. National
Laboratory of Solid State Microstructures, School of Physics, and
Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
2. Synergetic
Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
3. State
Key Laboratory on Integrated Optoelectronics and College of Electronic
Science and Engineering, Jilin University, Changchun 130012, China
4. Key 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
5. Department
of Physics, University of Arkansas, Fayetteville, Arkansas 72701, United States