1. National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
2. SEU-FEI Nano-Pico Center, Key Laboratory of MEMS of Ministry of Education, and School of Electronic Science and Engineering, Southeast University, Nanjing 210096, China
3. Materials Simulation & Modelling, Department of Applied Physics, Eindhoven University of Technology, Eindhoven 5600 MB, The Netherlands
4. College of Engineering and Applied Sciences and MOE Key Laboratory of Intelligent Optical Sensing and Manipulation, Nanjing University, Nanjing 210093, China
5. Key Laboratory of Flexible Electronics (KLOFE) and Institute of Advanced Materials (IAM), Nanjing Tech University, Nanjing 211816, China
6. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
7. Department of Physics, University of Arkansas, Fayetteville, Arkansas 72701, United States