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계산과학부

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세미나

Seminar
FIELD Computational Sciences
DATE October 30 (Fri), 2020
TIME 15:00-18:00
PLACE 1503
SPEAKER Choi, Hyoung Joon
HOST Son, Young-Woo
INSTITUTE 연세대학교
TITLE Electronic structure and electron-phonon interaction in twisted graphene layers
ABSTRACT Magic-angle twisted bilayer graphene (MA-TBG) has been drawing a lot of attention for its superconducting and insulating phases derived from flat bands. We perform atomistic calculations of electronic structures, phonon dispersions, and electron-phonon coupling strength in MA-TBG, showing that the electron-phonon coupling in MA-TBG is strong enough to produce experimentally observed superconductivity [1]. We also perform atomistic calculations of electronic structures in twisted double bilayer graphene (TDBG), showing that flat bands can be produced in TDBG by applied electric fields [2]. We investigate phonon dispersions and electron-phonon coupling strength in TDBG based on atomistic calculations, and compare electron-phonon coupling in MA-TBG and TDBG from an atomistic point of view. Based on these results, we discuss role of electron-phonon interaction for superconductivity in twisted graphene layers.
[1] Y. W. Choi and H. J. Choi, Phys. Rev. B 98, 241412 (2018).
[2] Y. W. Choi and H. J. Choi, Phys. Rev. B 100, 201402 (2019).
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