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

TL;DR

This paper explains how resonant anti-shielding (RAS) enhances superconductivity in ultrathin FeSe films on SrTiO3 by amplifying electron pairing, potentially leading to bipolaronic superfluidity and high critical temperatures.

Contribution

It introduces RAS as a key mechanism for superconductivity enhancement in 2D materials and links it to bipolaronic superfluidity, supported by experimental and simulation evidence.

Findings

RAS explains enhanced superconductivity in FeSe/STO.

Evidence suggests RAS drives bipolaronic superfluidity.

RAS offers a new approach for high-Tc superconductor design.

Abstract

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.