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DTSTART;TZID=Europe/Paris:20261021T110000
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DTSTAMP:20261015T132750Z
CREATED:20261015T132750Z
LAST-MODIFIED:20261015T132750Z
UID:10000305-1792580400-1792584000@sfp-alpes.fr
SUMMARY:Vadim PLASTOVETS (University of Augsburg)
DESCRIPTION:Cavity-controlled superconductivity : interplay of matter and photonic fluctuations\nRésumé : \nConfining electromagnetic fields in a cavity reshapes the photonic environment of a superconductor\, providing a tunable control of its superfluid stiffness. We show that the sign of this effect depends qualitatively on the underlying superconducting regime. In conventional low-temperature BCS superconductors\, cavity-photon-mediated electron-electron interactions renormalize the kinetic mass of Cooper pairs\, leading to a reduction of effective superfluid density near critical temperature. In contrast\, in phase-fluctuating two-dimensional superconductors (such as underdoped cuprates)\, the cavity reshapes the collective plasma mode and can thereby suppress thermally excited phase fluctuations\, effectively enhancing the superfluid stiffness. These theoretical findings provide a possible explanation for recent experimental observations in niobium- and cuprate-based systems. \n_ \nContact : pierre.nataf@lpmmc.cnrs.fr
URL:https://sfp-alpes.fr/event/vadim-plastovets-university-of-augsburg/
LOCATION:LPMMC – salle Roger Maynard (G421)\, CNRS - LPMMC 25 avenue des Martyrs\, Grenoble\, 38042\, France
CATEGORIES:Séminaire
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