1. Institute of Physics Academia Sinica Taipei Taiwan 11529 ROC
2. Department of Physics National Chung Hsing University Taichung Taiwan 40227 ROC
3. Graduate Institute of Manufacturing Technology National Taipei University of Technology Taipei Taiwan 10608 ROC
4. Institute of Earth Sciences Academia Sinica Taipei Taiwan 11529 ROC
5. Department of Physics National Tsing Hua University Hsinchu Taiwan 30013 ROC
6. Graduate Institute of Applied Physics National Chengchi University Taipei Taiwan 11605 ROC