Concomitant enhancement of electron-phonon coupling and electron-electron interaction in graphene decorated with ytterbium
Abstract
The interplay between electron-electron interaction and electron-phonon coupling has been one of the key issues in graphene as it can provide information on the origin of enhanced electron-phonon coupling in graphene by foreign atoms. In ytterbium-decorated graphene on SiC substrate, electron-phonon coupling exhibits strong enhancement compared to that of as-grown graphene. Based on angle-resolved photoemission study, the presence of ytterbium is also found to result in the decrease of Fermi velocity, revealing the enhancement of electron-electron interaction within the Fermi liquid theory. Our finding on the concomitant enhancement of electron-electron interaction and electron-phonon coupling suggests a possibility of the interplay between the two representative many-body interactions in graphene decorated with foreign atoms.
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Cite
@article{arxiv.2007.09387,
title = {Concomitant enhancement of electron-phonon coupling and electron-electron interaction in graphene decorated with ytterbium},
author = {Minhee Kang and Jinwoong Hwang and Ji-Eun Lee and Alexei Fedorov and Choongyu Hwang},
journal= {arXiv preprint arXiv:2007.09387},
year = {2020}
}
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