1. Research Center for Novel Epitaxial Quantum Architectures, Seoul National University, Seoul, Republic of Korea
2. Graduate School of Semiconductor Materials and Devices Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
3. Department of Physics, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Republic of Korea
4. Division of Materials Science and Engineering, Hanyang University, Seoul, Republic of Korea
5. Department of Physics and Astronomy & Institute of Applied Physics, Seoul National University, Seoul, Republic of Korea
6. Research Institute of Advanced Materials (RIAM), Seoul National University, Seoul, Republic of Korea