1. Department of Materials Science and Engineering National Yang Ming Chiao Tung University No. 1001, University Rd., East Dist. Hsinchu City 30010 Taiwan
2. Department of Electrophysics National Yang Ming Chiao Tung University No. 1001, University Rd., East Dist. Hsinchu City 30010 Taiwan
3. Research Center for Applied Sciences Academia Sinica No. 128, Sec. 2, Academia Rd., Nangang Dist. Taipei City 11529 Taiwan
4. Center for the Intelligent Semiconductor Nano‐system Technology Research National Yang Ming Chiao Tung University No. 1001, University Rd., East Dist. Hsinchu City 30010 Taiwan