A Microscopic Theory of Odd-freqeuncy Pairing in the Two-dimensional Extended Hubbard Model

TL;DR

This paper develops a microscopic theory explaining how odd-frequency spin-triplet pairing can be stabilized in a two-dimensional extended Hubbard model, especially near the spin-density-wave critical point, influenced by frustration and off-site interactions.

Contribution

It introduces a novel microscopic framework for odd-frequency pairing in the extended Hubbard model, highlighting the roles of frustration and off-site Coulomb interactions.

Findings

Odd-frequency spin-triplet pairing can be stabilized near the SDW critical point.

Geometrical frustration favors odd-frequency pairing.

Off-site Coulomb interactions are crucial for pairing stability.

Abstract

We present a microscopic theory of fluctuation-mediated pairing mechanism in a two-dimensional extended Hubbard model. In contrast to conventional wisdom, odd-frequency spin-triplet pairing can be stabilized near the spin-density-wave critical point. Favorable conditions for the odd-frequency pairing are the presence of geometrical frustration and off-site Coulomb interaction.