1. Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China
2. Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra, ACT 2601, Australia
3. Key Laboratory of Quantum Information, University of Science and Technology of China, CAS, Hefei 230026, China
4. Department of Quantum and Energy Materials, International Iberian Nanotechnology Laboratory (INL), Braga 4715-330, Portugal
5. Beijing Computational Science Research Center, Beijing 100094, China
6. Department of Electronic and Electrical Engineering, University College London, London WC1E 7JE, United Kingdom