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Exploring Superconductivity under Strong Coupling with the Vacuum Electromagnetic Field | | Anoop Thomas
; Eloïse Devaux
; Kalaivanan Nagarajan
; Thibault Chervy
; Marcus Seidel
; David Hagenmüller
; Stefan Schütz
; Johannes Schachenmayer
; Cyriaque Genet
; Guido Pupillo
; Thomas W. Ebbesen
; | | Date: |
4 Nov 2019 | | Abstract: | Light-matter interactions have generated considerable interest as a means to
manipulate material properties. Light-induced superconductivity has been
demonstrated using pulsed lasers. An attractive alternative possibility is to
exploit strong light-matter interactions arising by coupling phonons to the
vacuum electromagnetic field of a cavity mode as has been suggested and
theoretically studied. Here we explore this possibility for two very different
superconductors, namely YBCO (YBa$_2$Cu$_3$O$_{6+x}$) and Rb$_3$C$_{60}$,
coupled to surface plasmon polaritons, using a novel cooperative effect based
on the presence of a strongly coupled vibrational environment allowing
efficient dressing of the otherwise weakly coupled phonon bands of these
compounds. By placing the superconductor-surface plasmon system in a SQUID
magnetometer, we find that the superconducting transition temperatures
($T_{c}$) for both compounds are modified in the absence of any external laser
field. For YBCO, $T_{c}$ decreases from 92 K to 86 K while for Rb$_3$C$_{60}$,
it increases from 30 K to 45 K at normal pressures. In the latter case, a
simple theoretical framework is provided to understand these results based on
an enhancement of the electron-phonon coupling. This proof-of-principle study
opens a new tool box to not only modify superconducting materials but also to
understand the mechanistic details of different superconductors. | | Source: | arXiv, 1911.1459 | | Services: | Forum | Review | PDF | Favorites | |
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