Enhanced superconductivity in ultrathin FeSe films on SrTiO3 via resonant anti-shielding: Superconductivity meets superfluidity

Fuente: arXiv
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Main Authors: Kempa, Krzysztof, Naughton, Michael J., Weitering, Hanno H.
Format: Preprint
Published: 2025
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author Kempa, Krzysztof
Naughton, Michael J.
Weitering, Hanno H.
author_facet Kempa, Krzysztof
Naughton, Michael J.
Weitering, Hanno H.
contents A vanishingly small dielectric function reflects a singular polarization response in a medium, leading to collective plasmonic or polaronic excitations that can enhance Cooper pairing in superconductors via a resonant anti-shielding (RAS) effect. Here, we show that RAS can explain the dramatic enhancement of superconductivity-relative to bulk FeSe, observed in single-unit-cell FeSe films on SrTiO$_3$ (STO) and related substrates. Moreover, we present evidence that RAS may play a central role in driving the Cooper pair condensate into a bipolaronic superfluid state. This interpretation aligns with a recent quantum Monte Carlo simulation by Zhang, et al. [Phys. Rev. X 13, 011010 (2023)], which indicated enhanced bipolaronic superconductivity in two-dimensional systems with moderately strong electron-phonon coupling. RAS may therefore represent a promising strategy for engineering high-T$_c$ superconducting heterostructures.
format Preprint
id arxiv_https___arxiv_org_abs_2508_09063
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Enhanced superconductivity in ultrathin FeSe films on SrTiO3 via resonant anti-shielding: Superconductivity meets superfluidity
Kempa, Krzysztof
Naughton, Michael J.
Weitering, Hanno H.
Superconductivity
A vanishingly small dielectric function reflects a singular polarization response in a medium, leading to collective plasmonic or polaronic excitations that can enhance Cooper pairing in superconductors via a resonant anti-shielding (RAS) effect. Here, we show that RAS can explain the dramatic enhancement of superconductivity-relative to bulk FeSe, observed in single-unit-cell FeSe films on SrTiO$_3$ (STO) and related substrates. Moreover, we present evidence that RAS may play a central role in driving the Cooper pair condensate into a bipolaronic superfluid state. This interpretation aligns with a recent quantum Monte Carlo simulation by Zhang, et al. [Phys. Rev. X 13, 011010 (2023)], which indicated enhanced bipolaronic superconductivity in two-dimensional systems with moderately strong electron-phonon coupling. RAS may therefore represent a promising strategy for engineering high-T$_c$ superconducting heterostructures.
title Enhanced superconductivity in ultrathin FeSe films on SrTiO3 via resonant anti-shielding: Superconductivity meets superfluidity
topic Superconductivity
url https://arxiv.org/abs/2508.09063