Electric field control of superconducting fluctuations and quasiparticle interference at oxide interfaces
Abstract
We investigate tunable superconducting transitions in (111) field-effect devices. Large increases in conductivity, associated with superconducting fluctuations, are observed far above the transition temperature. However, the standard Aslamazov-Larkin paraconductivity model significantly underestimates the effect observed here. We use a model that includes conductivity corrections from normal state quasiparticle interference together with all contributions from superconducting fluctuations evaluated at arbitrary temperatures and in the short-wavelength limit. Through analysis of the magnetoconductance and resistive transitions, we find that the large conductivity increase can be explained by a combination of weak anti-localization and Maki-Thompson superconducting fluctuations. Both contributions are enabled by a strong temperature dependence of the electron's decoherence time compatible with an electron-phonon scattering scenario. We find that conductivity corrections are modulated by the electrostatic field effect, that governs a competition between normal-state quasiparticle interference and superconducting fluctuations.
Keywords
Cite
@article{arxiv.2506.17056,
title = {Electric field control of superconducting fluctuations and quasiparticle interference at oxide interfaces},
author = {Graham Kimbell and Ulderico Filippozzi and Stefano Gariglio and Marc Gabay and Andreas Glatz and Andrey Varlamov and Andrea Caviglia},
journal= {arXiv preprint arXiv:2506.17056},
year = {2025}
}