1. Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
2. International Intercollegiate Ph.D. Program, National Tsing Hua University, Hsinchu 30013, Taiwan
3. College of Semiconductor Research, National Tsing Hua University, Hsinchu 30013, Taiwan
4. Department of Physics, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
5. Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
6. Semiconductor Research Center, Hon Hai Research Institute, Taipei 11492, Taiwan
7. Department of Engineering and System Science, National Tsing Hua University, Hsinchu 30013, Taiwan
8. Department of Electronic Engineering, National Yang Ming Chiao Tung University, Hsinchu 30013, Taiwan
9. Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong 999077, China