1. Institute
of Atomic and Molecular Sciences, Academia Sinica, PO Box 23-166, 10617 Taipei, Taiwan
2. Department
of Chemistry, National Taiwan University, 10617 Taipei, Taiwan
3. Nano
Science and Technology Program, Taiwan International Graduate Program, Academia Sinica and National Taiwan University, 10617 Taipei, Taiwan
4. Department
of Materials Science and Engineering, National Taiwan University, 10617 Taipei, Taiwan
5. Center
for Condensed Matter Sciences, National Taiwan University, 10617 Taipei, Taiwan
6. Department
of Physics, National Taiwan University, 10617 Taipei, Taiwan