1. Department of Physics/QTC/Hi-GEM, National Cheng Kung University, Tainan 70148, Taiwan
2. Center of General Studies, National Kaohsiung University of Science and Technology, Kaohsiung 811213, Taiwan
3. Department of Energy and Refrigerating Air-Conditioning Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 811213, Taiwan