National Chiao Tung University, affiliation not provided to SSRN, National Synchrotron Radiation Research Center, National Chiao Tung University, National Chiao Tung University, University of Science and Technology of China (USTC) - National Synchrotron Radiation Laboratory Research Center, National Chi Nan University, Indian Institute of Technology (IIT), Delhi - Department of Physics, National Chung Hsing University and National Chung Hsing University