1. Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
2. Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea
3. Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul 08826, Republic of Korea
4. Department of Materials Science & Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, United Kingdom
5. London Centre for Nanotechnology and UCL Centre for Materials Discovery, University College London, London WC1E 6BT, United Kingdom
6. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom
7. Department of Physics, Kyoto University, Kyoto 606-8502, Japan
8. Quantum Functional Semiconductor Research Center (QSRC), Dongguk University, Seoul 04620, Republic of Korea
9. Division of Physics and Semiconductor Science, Dongguk University, Seoul 04620, Republic of Korea
10. Department of Physics, Chung-Ang University, Seoul 06974, Republic of Korea
11. Department of Physics, University of Seoul, Seoul 02504, Republic of Korea
12. Natural Science Research Institute, University of Seoul, Seoul 02504, Republic of Korea
13. School of Physics, Korea Institute for Advanced Study, Seoul 02455, Republic of Korea
14. Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei 230026, China