Atomistic Study on Electron-Phonon Coupling in Twisted Graphene Layers
ORAL
Abstract
We investigate electron-phonon coupling in twisted graphene layers based on atomistic calculations of electronic structure, phonon dispersion, and electron-phonon matrix elements. First, we study electron-phonon coupling strength in twisted double bilayer graphene (TDBG). Then, we study effects of vertical electric field on electron-phonon coupling strength in TDBG. Also, we compare the electron-phonon coupling in TDBG and magic-angle twisted bilayer graphene from an atomistic point of view. Based on these results, we discuss roles of electron-phonon interaction for superconductivity in twisted graphene layers.
*This work was supported by NRF of Korea (Grant No. 2020R1A2C3013673) and KISTI supercomputing center (Project No. KSC-2019-CRE-0195). Y.W.C. acknowledges support from NRF of Korea (Global Ph.D. Fellowship Program NRF-2017H1A2A1042152).
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Presenters
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Young Woo Choi
- Department of Physics, Yonsei University
- Yonsei University