1. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
2. Department of Physics, National Taiwan University, Taipei 10617, Taiwan
3. International Graduate Program of Molecular Science and Technology, National Taiwan University, Taipei 10617, Taiwan
4. Molecular Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei 10617, Taiwan
5. Department of Electronic Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
6. Institute of Earth Science, Academia Sinica, Taipei 11529, Taiwan