1. Center for Condensed Matter Sciences National Taiwan University No. 1, Section 4, Roosevelt Road Taipei City 10617 Taiwan
2. Institute of Physics Academia Sinica No. 128, Sec. 2, Academia Rd., Nangang Dist. Taipei City 115201 Taiwan
3. Center of Atomic Initiative for New Materials National Taiwan University Taipei City 10617 Taiwan
4. National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan
5. Department of Applied Chemistry National Chi Nan University Puli 545 Taiwan
6. Institute of Atomic and Molecular Sciences Academia Sinica Taipei City 10617 Taiwan