Enhanced Superconducting Diode Effect in the Asymmetric Hatsugai-Kohmoto Model

TL;DR

This paper investigates how strong electron-electron interactions, modeled by the Hatsugai-Kohmoto interaction, can enhance the superconducting diode effect in asymmetric band metals, providing new insights into correlated superconductivity.

Contribution

It introduces the study of the superconducting diode effect within exactly solvable models with strong correlations, revealing interaction-induced enhancement of the effect.

Findings

HK interaction enhances the SDE's quality factor.

Strong correlations influence the supercurrent nonreciprocity.

The model provides a new perspective on correlated superconductivity.

Abstract

The superconducting diode effect (SDE), characterized by a nonreciprocal supercurrent, has attracted significant attention in recent years due to its potential applications. However, most studies have focused on weakly correlated models, leaving the impact of strong electron-electron interactions on the SDE largely unexplored. In this work, we bridge this gap by investigating the SDE in asymmetric band metals with Hatsugai-Kohmoto (HK) interaction, which are exactly solvable due to their locality in Bloch momentum space. Through a combination of low-energy analysis and a numerical self-consistent approach, we demonstrate that HK interaction can enhance the SDE's quality factor. Our findings shed light on the role of strong electron-electron correlations in shaping the SDE.