1. Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
2. Department of Electrical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
3. Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan
4. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8565, Japan
5. Department of Vehicle Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
6. Department of Physics, Tamkang University, New Taipei City 25137, Taiwan
7. The Institute of Scientific and Industrial Research (ISIR-SANKEN), Osaka University, Osaka 567-0047, Japan
8. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan
9. Center of Atomic Initiative for New Materials (AI-MAT), National Taiwan University, Taipei 10617, Taiwan