1. Department of Physics, National Central University, Taoyuan 32001, Taiwan
2. Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
3. Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
4. Department of Physics, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
5. Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana−Champaign, Urbana, Illinois 61801, United States
6. Department of Physics, National Cheng Kung University, Tainan 70101, Taiwan
7. Taiwan Consortium of Emergent Crystalline Materials, National Science and Technology Council, Taipei 106, Taiwan
8. Department of Physics, National Taiwan Normal University, Taipei 11677, Taiwan
9. Center for Emergent Functional Matter Science (CEFMS), National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
10. Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan
11. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Ibaraki 304-0044, Japan