1. Department of Materials Science and Engineering, Shenzhen Institute for Quantum Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
2. School of Science, Harbin Institute of Technology (Shenzhen), Shenzen 518055, China
3. Department of Physics and London Centre for Nanotechnology, King’s College London, Strand, London WC2R 2LS, United Kingdom