1. a Department of Physics and Materials Science, Faculty of Science , Chiang Mai University , Chiang Mai, 50200, Thailand
2. b Department of Materials Science , School of Science and Technology, Naresuan University , Phayao, Thailand
3. c Deparment of Electrical and Computer Engineering , College of Engineering, The University of Texas at San Antonio , San Antonio, Texas, 78249, USA
4. d School of Physics , Institute of Science, Suranaree University of Technology , Nakorn Ratchasima, 30000, Thailand