1. Department of Physics, Hanyang University (HYU), Seoul 04763, Republic of Korea
2. Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
3. Department of Materials Science and Engineering, Phenikaa University, Hanoi 12116, Viet Nam
4. Department of Physics, Kunsan National University, Kunsan 54150, Republic of Korea
5. Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science, Suwon 16419, Republic of Korea
6. Department of Energy Engineering, Hanyang University (HYU), Seoul 04763, Republic of Korea