Concomitant enhancement of electron-phonon coupling and electron-electron interaction in graphene decorated with ytterbium
- Author(s): Kang, M
- Hwang, J
- Lee, JE
- Fedorov, A
- Hwang, C
- et al.
Published Web Locationhttps://doi.org/10.1016/j.apsusc.2018.10.134
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.