期刊
2D MATERIALS
卷 10, 期 4, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/2053-1583/acf944
关键词
layered superconductors; plasmons; phonon-plasmon hybridization; unconventional superconductivity; superconductivity theory
The coupling between electrons and plasmons in two-dimensional metals has a significant impact on superconductivity. This study investigates the interplay between electron-electron and electron-phonon interactions in the theory of 2D superconductivity using a one-loop theory with accurate treatment of electron-phonon, electron-plasmon, and phonon-plasmon coupling. The results show that the strength of the Coulomb interaction and external screening can control the enhancement or suppression of superconductivity.
Two-dimensional (2D) metals can host gapless plasmonic excitations that strongly couple to electrons and thus may significantly affect superconductivity. To investigate the dynamical interplay of the electron-electron and electron-phonon interactions in the theory of 2D superconductivity, we apply a full momentum- and frequency-dependent one-loop theory treating electron-phonon, electron-plasmon, and phonon-plasmon coupling with the same accuracy. We tune the strength of the Coulomb interaction by varying the external screening & epsilon;ext to the layered superconductor and find three distinct regions. At weak screening, superconductivity is mediated by plasmons. In the opposite limit conventional electron-phonon interactions dominate. In between, we find a suppressed superconducting state. Our results show that even in conventional electron-phonon coupled layered materials, superconductivity can be significantly enhanced by the electron-plasmon coupling in a manner that can be controlled by the external screening.
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