1. Center of Optoelectronic Materials and Devices, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
2. Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Republic of Korea
3. Research Laboratory of Electronics, Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, United States
4. Van der Waals Materials Research Center, Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
5. School of Advanced Materials Science and Engineering, SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Republic of Korea
6. Center for Electronic Materials Research, Post-Silicon Semiconductor Institute, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
7. Advanced Analysis Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea
8. School of Physics, Northeast Normal University, Changchun 130024, China
9. Division of Nano and Information Technology, KIST School, University of Science and Technology (UST), Seoul 02792, Republic of Korea
10. Department of Electronic Engineering, Inha University, Incheon 22212, Republic of Korea