Even-odd parity transition in strongly correlated locally noncentrosymmetric superconductors : An application to CeRh$_2$As$_2$

TL;DR

This paper investigates the effects of strong electron correlations on the superconducting phase diagram of CeRh$_2$As$_2$, revealing an even-odd parity transition that clarifies experimental discrepancies and advances understanding of topological superconductors.

Contribution

It introduces a detailed analysis of Coulomb interactions in locally noncentrosymmetric superconductors, demonstrating a parity transition and resolving previous theoretical-experimental inconsistencies.

Findings

Identification of even-odd parity transition in strongly correlated superconductors

Enhanced parity transition field explained by Coulomb interactions

Resolution of discrepancies in CeRh$_2$As$_2$ phase diagram

Abstract

The discovery of the multiple $H$-$T$ phase diagram of CeRh$_2$As$_2$ offers a new route to designing topological superconductors. Although weak-coupling theories explain the experimental phase diagram qualitatively, a quantitative discrepancy between them has discouraged conclusive interpretation. In this Letter, we thoroughly study the effect of Coulomb interaction and the phase diagrams of locally noncentrosymmetric superconductors. We reveal even-odd parity transition and the enhancement of the parity transition field in strongly correlated superconductors, and an issue of CeRh$_2$As$_2$ is resolved.