1. Department of Physics, BRL, and EHSRC, University of Ulsan, Ulsan 44610, Republic of Korea
2. Department of Physics, University of Seoul, Seoul 02504, Republic of Korea
3. Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
4. Advanced Light Source (ALS), E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
5. Department of Physics and Astronomy, Interdisciplinary Nanoscience Center, Aarhus University, 8000 Aarhus C, Denmark
6. Center for Correlated Electron Systems, Institute for Basic Science (IBS), Seoul 08826, Republic of Korea
7. Department of Physics and Astronomy, Seoul National University (SNU), Seoul 08826, Republic of Korea
8. Institute of Physics, Academia Sinica, Taipei 10617, Taiwan
9. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan