Abstract
We study the impact of a time-dependent external driving of the lattice phonons in a minimal model of a BCS superconductor. Upon evaluating the driving-induced vertex corrections of the phonon-mediated electron-electron interaction, we show that parametric phonon driving can be used to elevate the critical temperature T c , while a dipolar phonon drive has no effect. We provide simple analytic expressions for the enhancement factor of T c . Furthermore, a mean-field analysis of a nonlinear phonon-phonon interaction also shows that phonon anharmonicities further amplify T c . Our results hold universally for the large class of normal BCS superconductors.
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Komnik, A., Thorwart, M. BCS theory of driven superconductivity. Eur. Phys. J. B 89, 244 (2016). https://doi.org/10.1140/epjb/e2016-70528-1
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DOI: https://doi.org/10.1140/epjb/e2016-70528-1