Induced odd-frequency superconducting state in vertex-corrected Eliashberg theory
Abstract
We show that vertex corrections to Migdal's theorem in general induce an odd-frequency spin-triplet superconducting order parameter, which coexists with its more commonly known even-frequency spin-singlet counterpart. Fully self-consistent vertex-corrected Eliashberg theory calculations for a two dimensional cuprate model, isotropically coupled to an Einstein phonon, confirm that both superconducting gaps are finite over a wide range of temperatures. The subordinate -wave odd-frequency superconducting gap is found to be one order of magnitude smaller than the primary even-frequency -wave gap. Our study provides a direct proof of concept for a previously unknown generation mechanism of odd-frequency superconductivity as well as for the generic coexistence of both superconducting states in bulk materials.
Keywords
Cite
@article{arxiv.2108.08124,
title = {Induced odd-frequency superconducting state in vertex-corrected Eliashberg theory},
author = {Fabian Schrodi and Alex Aperis and Peter M. Oppeneer},
journal= {arXiv preprint arXiv:2108.08124},
year = {2021}
}