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TT: Fachverband Tiefe Temperaturen

TT 91: Superconductivity: Theory II

TT 91.2: Vortrag

Donnerstag, 12. März 2026, 17:45–18:00, HSZ/0101

Cavity-control of the Ginzburg-Landau stiffness in superconductors — •Vadim Plastovets and Francesco Piazza — Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany

Confining light around solids via cavities enhances the coupling between the electromagnetic fluctuations and the matter. We predict that in superconductors this cavity-enhanced coupling enables the control of the order-parameter stiffness, which governs key length scales such as the coherence length of Cooper pairs and the magnetic penetration depth. We explain this as a renormalization of the Cooper-pair kinetic mass caused by photon-mediated repulsive interactions between the electrons building the pair. This effect is generic for Bardeen-Cooper-Schriffer superconductors and is most pronounced in low-Tc materials. The strength of this effect can be tuned via the length of the cavity and we estimate it to be sizable for cavities in the infrared range.

Keywords: Cavity quantum electrodynamics; Ginzburg-Landau theory; Meissner effect