1. Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, South Korea
2. Department of Physics and Astronomy, Seoul National University (SNU), Seoul 08826, South Korea
3. Department of Physics, University of Ulsan, Ulsan 44610, South Korea
4. Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science and Technology, Daegu 42988, South Korea