1. International Center for Young Scientists (ICYS), WPI International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
2. Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
3. National Synchrotron Radiation Research Center, Hsinchu Science Park, Hsinchu 30076, Taiwan
4. Department of Electrophysics, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
5. Research Institute for Science and Technology, Tokyo University of Science, Chiba 278-8510, Japan
6. Department of Chemical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
7. Center of Atomic Initiative for New Materials (AI-MAT), National Taiwan University, Taipei 10617, Taiwan