1. Molecular Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei 106, Taiwan
2. International Graduate Program of Molecular Science and Technology, National Taiwan University, Taipei 10617, Taiwan
3. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 106, Taiwan
4. Department of Physics, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
5. Department of Physics, National Taiwan University, Taipei 106, Taiwan
6. Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei 106, Taiwan
7. Center for Theoretical and Computational Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
8. Physics Division, National Center for Theoretical Sciences, Taipei 10617, Taiwan