1. Department of Electrophysics National Yang Ming Chiao Tung University Hsinchu 30010 Taiwan
2. National Synchrotron Radiation Research Center 101 Hsin‐Ann Road Hsinchu 30076 Taiwan
3. Department of Physics National Cheng Kung University Tainan 70101 Taiwan
4. Center for Quantum Frontiers of Research & Technology (QFort) National Cheng Kung University Tainan 70101 Taiwan
5. Max‐Planck Institute for Chemical Physics of Solids Nöthnitzer Str. 40 Dresden 01187 Germany
6. Department of Quantum Matter ADSM Hiroshima University Higashi‐Hiroshima 739–8530 Japan