1. Institute of Electronics Engineering National Tsing Hua University Hsinchu 30013 Taiwan
2. Department of Materials Science and Engineering, and Frontier Research Center on Fundamental and Applied Sciences of Matters National Tsing Hua University Hsinchu 30013 Taiwan
3. Department of Physics National Sun Yat‐Sen University Kaohsiung 80424 Taiwan
4. Design Technology Division Taiwan Semiconductor Manufacturing Company Hsinchu 300 Taiwan