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. Pohang Accelerator Laboratory, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea