1. Department of Materials Science and Engineering, National Tsing-Hua University, Hsinchu, 30013, Taiwan
2. College of Semiconductor Research, National Tsing-Hua University, Hsinchu, 30013, Taiwan
3. Department of Physics, National Sun Yat-Sen University, Kaohsiung, 80424, Taiwan
4. Department of Physics and Quantum Information Center, Chung Yuan Christian University, Taoyuan, 32034, Taiwan
5. Institute of Electronics Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
6. Department of Materials Science and Engineering, Korea University, Seoul 02841, Republic of Korea