1. Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon 16419, Republic of Korea
2. Sungkyunkwan University, Suwon 16419, Republic of Korea
3. Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
4. Advanced Facility Center for Quantum Technology, Sungkyunkwan University, Suwon 16419, Republic of Korea