1. School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2. Institute for Advanced Materials, South China Academy of Advanced Optoelectronics, and Key Laboratory of Quantum Engineering and Quantum Materials, South China Normal University, Guangzhou 510006, China
3. Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
4. National Laboratory of Solid State Microstructures and Innovative Center for Advanced Microstructures, Nanjing University, Nanjing 210093, China