BCS theory of driven superconductivity

• Verfasst von: Komnik, Andreas [VerfasserIn]
• Verfasst von: Thorwart, Michael [VerfasserIn]
• Titel: BCS theory of driven superconductivity
• Verf.angabe: Andreas Komnik, Michael Thorwart
• E-Jahr: 2016
• Jahr: 09 November 2016
• Umfang: 5 S.
• Fussnoten: Gesehen am 14.05.2020
• Titel Quelle: Enthalten in: The European physical journal / B
• Ort Quelle: Berlin : Springer, 1998
• Jahr Quelle: 2016
• Band/Heft Quelle: 89(2016), 11, Artikel-ID 244, Seite 1-5
• ISSN Quelle: 1434-6036
• DOI: doi:10.1140/epjb/e2016-70528-1
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1698278055

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 Tc, while a dipolar phonon drive has no effect. We provide simple analytic expressions for the enhancement factor of Tc. Furthermore, a mean-field analysis of a nonlinear phonon-phonon interaction also shows that phonon anharmonicities further amplify Tc. Our results hold universally for the large class of normal BCS superconductors.