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일시: 22년 10월 13일(목) 오후 4시 30분
장소: 숭실대학교 진리과 522호 이효계강의실
Electronic and phononic properties of twisted two-dimensional materials
Hyoung Joon Choi(최형준 교수)
Department of Physics, Yonsei University, Seoul, Korea
(연세대학교 물리학과)
Twisted layers of two-dimensional materials such as graphene, black phosphorus, and transition-metal dichalcogenides have emerged as a new platform of novel electronic structures. Since they have large moiré supercells typically, it becomes a challenge to perform accurate theoretical calculations of their electronic structures. Here, we present theoretical approaches for efficient calculations of twisted graphene layers [1], and discuss their results on doping dependence of electronic structures and spin-valley polarization [1]. We also present applications of a simplified atomistic approach to atomic and phononic structures of twisted graphene layers [2-4] and twisted transition-metal dichalcogenide layers [5], and discuss their atomic and phononic structures [2-5]. In addition, we discuss peculiar electronic structures of twisted black phosphorus layers [6].
[1] Yosep Cho, Young Woo Choi, and Hyoung Joon Choi, in preparation.
[2] Young Woo Choi and Hyoung Joon Choi, Phys. Rev. B 98, 241412 (2018).
[3] Young Woo Choi and Hyoung Joon Choi, Phys. Rev. B 100, 201402 (2019).
[4] Young Woo Choi and Hyoung Joon Choi, Phys. Rev. Lett. 127, 167001 (2021).
[5] Han-gyu Kim, Young Woo Choi, and Hyoung Joon Choi, in preparation
[6] Taesik Nam, Han-gyu Kim, and Hyoung Joon Choi, in preparation