1. Department of Physics; National Taiwan University; Taipei 106 Taiwan
2. Nano-Science and Technology Program; Taiwan International Graduate Program; Academia Sinica; Taipei 106 Taiwan
3. Institute of Chemistry; Academia Sinica; Taipei 115 Taiwan
4. Department of Engineering and System Science; National Tsing Hua University; Hsinchu 300 Taiwan
5. Department of Physics; National Central University; Taoyuan 320 Taiwan