Atomistic Caculation of 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 calculate twisted double bilayer graphene (TDBG). Then, we analyze the characteristics of important phonon modes that have strong contributions to the total coupling strength. Also, we compare the electron-phonon coupling in TDBG and magic-angle twisted bilayer graphene in the context of the recent experimental observations of superconductivity in these systems. Our work provides microscopic understanding of the electron-phonon coupling in twisted graphene layers, which is a basis for explaining superconducting mechanism of these systems.
*This work was supported by NRF of Korea (Grant No. 2011-0018306) and KISTI supercomputing center (Project No. KSC-2018-CRE-0097). 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, Seoul 03722, Korea
- Department of Physics, Yonsei University, Seoul, 03722, Korea
- Institute of Physics and Applied Physics, Yonsei University