Saved in:
| Main Authors: | , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2303.06220 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866916362167779328 |
|---|---|
| author | Veld, Yann in 't Katsnelson, Mikhail I. Millis, Andrew J. Rösner, Malte |
| author_facet | Veld, Yann in 't Katsnelson, Mikhail I. Millis, Andrew J. Rösner, Malte |
| contents | Two-dimensional (2D) metals can host gapless plasmonic excitations, which strongly couple to electrons and thus may significantly affect superconductivity in layered materials. To investigate the dynamical interplay of the electron-electron and electron-phonon interactions in the theory of 2D superconductivity, we apply a full momentum- and frequency-dependent one-loop theory treating electron-phonon, electron-plasmon, and phonon-plasmon coupling with the same accuracy. We tune the strength of the Coulomb interaction by varying the external screening $\varepsilon_{ext}$ to the layered superconductor and find three distinct regions. At weak screening, superconductivity is mediated by plasmons. In the opposite limit conventional electron-phonon interactions dominate. In between, we find a suppressed superconducting state. Our results show that even conventional electron-phonon mediated layered superconductors can be significantly affected by the electron-plasmon coupling in a weak screening environment. This unconventional pairing contribution can then be controlled by the external screening. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_06220 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Screening Induced Crossover between Phonon- and Plasmon-Mediated Pairing in Layered Superconductors Veld, Yann in 't Katsnelson, Mikhail I. Millis, Andrew J. Rösner, Malte Superconductivity Two-dimensional (2D) metals can host gapless plasmonic excitations, which strongly couple to electrons and thus may significantly affect superconductivity in layered materials. To investigate the dynamical interplay of the electron-electron and electron-phonon interactions in the theory of 2D superconductivity, we apply a full momentum- and frequency-dependent one-loop theory treating electron-phonon, electron-plasmon, and phonon-plasmon coupling with the same accuracy. We tune the strength of the Coulomb interaction by varying the external screening $\varepsilon_{ext}$ to the layered superconductor and find three distinct regions. At weak screening, superconductivity is mediated by plasmons. In the opposite limit conventional electron-phonon interactions dominate. In between, we find a suppressed superconducting state. Our results show that even conventional electron-phonon mediated layered superconductors can be significantly affected by the electron-plasmon coupling in a weak screening environment. This unconventional pairing contribution can then be controlled by the external screening. |
| title | Screening Induced Crossover between Phonon- and Plasmon-Mediated Pairing in Layered Superconductors |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2303.06220 |