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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2019
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/1911.01459 |
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| _version_ | 1866913769460858880 |
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| author | Thomas, Anoop Devaux, Eloïse Nagarajan, Kalaivanan Chervy, Thibault Seidel, Marcus Hagenmüller, David Schütz, Stefan Schachenmayer, Johannes Genet, Cyriaque Pupillo, Guido Ebbesen, Thomas W. |
| author_facet | Thomas, Anoop Devaux, Eloïse Nagarajan, Kalaivanan Chervy, Thibault Seidel, Marcus Hagenmüller, David Schütz, Stefan Schachenmayer, Johannes Genet, Cyriaque Pupillo, Guido Ebbesen, Thomas W. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1911_01459 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | Exploring Superconductivity under Strong Coupling with the Vacuum Electromagnetic Field Thomas, Anoop Devaux, Eloïse Nagarajan, Kalaivanan Chervy, Thibault Seidel, Marcus Hagenmüller, David Schütz, Stefan Schachenmayer, Johannes Genet, Cyriaque Pupillo, Guido Ebbesen, Thomas W. Superconductivity Quantum Physics 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. |
| title | Exploring Superconductivity under Strong Coupling with the Vacuum Electromagnetic Field |
| topic | Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/1911.01459 |