1. Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul08826, Republic of Korea
2. Department of Materials Science and Engineering and Research Institute of Advanced Materials, Seoul National University, Seoul08826, Republic of Korea
3. Department of Physics and Astronomy, Seoul National University, Seoul08826, Republic of Korea
4. Department of Physics, Ulsan National Institute of Science and Technology, Ulsan44919, Republic of Korea
5. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York11973, United States