1. Department of Physics, Khon Kaen University, Khon Kaen, Thailand
2. School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
3. Institute of Nanomaterials Research and Innovation for Energy (IN-RIE), NANOTEC-KKU RNN on Nanomaterials Research and Innovation for Energy, Khon Kaen University, Khon Kaen, 40002, Thailand
4. Department of Physics, Konkuk University, Seoul 05029, Republic of Korea
5. Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
6. School of Science and Technology, University of New England, Armidale, New South Wales 2351, Australia