1. Graduate Institute of Electronics Engineering and Department of Electrical Engineering, National Taiwan University, Taipei 106, Taiwan, Institute of Physics, Academia Sinica, Nankang 11529, Taipei, Taiwan, Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei 70608, Taiwan, Department of Material Science, National University of Tainan, Tainan 70005, Taiwan, Department of Physics, National Chang-Hua University of Education, Chang-Hua 500, Taiwan, Institute of...