1. Department of Electrophysics, National Yang-Ming Chiao-Tung University, Hsinchu 30010, Taiwan
2. Department of Nanotechnology, Faculty of Advanced Technology and Multidiscipline, Universitas Airlangga, Surabaya 60115, Indonesia
3. Institute of Multidisciplinary Research for Advanced Material (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi, Japan 980-8577
4. Department of Physics, School of Physical Sciences, Central University of Rajasthan, Ajmer-305817, India
5. Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
6. Department of Physics, National Tsinghua University, Hsinchu 30013, Taiwan