Realization of Berezinskii's superconductivity in quasi-one-dimensional systems

TL;DR

This paper demonstrates a microscopic mechanism for Berezinskii's odd-frequency spin-triplet s-wave superconductivity in quasi-one-dimensional systems driven by dominant charge fluctuations.

Contribution

It reveals how strong one-dimensionality and charge fluctuations enable Berezinskii's pairing symmetry, expanding understanding of unconventional superconductivity.

Findings

Spin-triplet s-wave pairing with odd-frequency symmetry can occur in quasi-1D systems.

Charge fluctuations can dominate over spin fluctuations, facilitating this pairing.

Provides a microscopic basis for Berezinskii's 1974 superconductivity proposal.

Abstract

We revisit the pairing symmetry competition in quasi-one-dimensional systems. We show that spin-triplet s-wave pairing, where the pair is formed by electrons with different times and has an odd-frequency symmetry, can be realized in systems with strong one-dimensionality when the strength of charge fluctuation dominates over spin fluctuation. The present study provides a novel microscopic mechanism for this exotic pairing originally proposed by Berezinskii in 1974.