| Affiliation: | 1. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, Taiwan;2. Department of Physics, National Taiwan Normal University, Taipei, Taiwan;3. Institute of Physics, Academia Sinica, Taipei, Taiwan;4. Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, Shanghai, China;5. Department of Physics, National Sun Yat‐sen University, Kaohsiung, Taiwan;6. Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya, Japan;7. Department of Physics, Durham University, UK;8. National Synchrotron Radiation Research Center, Hsinchu, Taiwan;9. Institute of Engineering Innovation, The University of Tokyo, Tokyo, Japan |
