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
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Abstract 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. -
van Schilfgaarde, M. ; Katsnelson, M. I. ( , Physical Review B)
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Glazyrin, K. ; Pourovskii, L. V. ; Dubrovinsky, L. ; Narygina, O. ; McCammon, C. ; Hewener, B. ; Schünemann, V. ; Wolny, J. ; Muffler, K. ; Chumakov, A. I. ; et al ( , Physical Review Letters)