1. Department of Materials
Science and Engineering, National Taiwan University of Science and Technology, No.43, Keelung Rd., Sec.4, Da’an Dist., Taipei 10607, Taiwan
2. National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science
Park, Hsinchu 30076, Taiwan
3. Institute of Atomic and Molecular Science, Academia Sinica, No. 1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan
4. Center for Condensed Matter Sciences, National Taiwan University, No.
1, Sec. 4, Roosevelt Rd., Taipei 10617, Taiwan