Enhanced superconductivity in ultrathin FeSe films on SrTiO3 via resonant anti-shielding: Superconductivity meets superfluidity
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| Main Authors: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909734422970368 |
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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 |