| Affiliation: | 1. Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu 30010, Taiwan ROC;2. Institute of Physics, National Chiao Tung University, Hsinchu 30010, Taiwan ROC;3. National Synchrotron Radiation Research Center, Hsinchu 30010, Taiwan ROC;4. Key Laboratory of Polar Materials and Devices, Ministry of Education, East China Normal University, ShangHai 200241, P. R. China;5. Nanostructures Research Laboratory, Japan Fine Ceramics Center, Nagoya 456‐8587, Japan;6. Institute of Engineering Innovation, the University of Tokyo, Tokyo 113‐8656, Japan |
