Author Affiliations

Myungjun Cha,^1,2 Taewoong Yoon,^1,2 Sungjun Park,^1,2 Kenji Watanabe,³ Takashi Taniguchi,³ Dohun Kim,^1,2 and Hyunyong Choi^1,2,*

¹Department of Physics and Astronomy, Seoul National University, Seoul, 08826, Korea

²Institute of Applied Physics, Seoul National University, Seoul, Korea

³Advanced Materials Laboratory, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan

^*Corresponding author: hy.choi@snu.ac.kr