Metal-insulator transition and thermal scales in $d$-wave altermagnet

TL;DR

This paper investigates the finite-temperature phase diagram of a strongly correlated $d$-wave altermagnet, revealing how electronic interactions influence magnetic and metallic phases.

Contribution

It provides the first non-perturbative finite-temperature analysis of a $d$-wave altermagnet, mapping out transition scales and the effects of geometric frustration.

Findings

Altermagnetism stabilizes a finite-temperature magnetic metal.

Interaction enhances the magnetic transition scale.

The study clarifies the role of strong correlations in altermagnets.

Abstract

We present the first finite-temperature study of a strongly correlated $d$-wave altermagnet across the Mott insulator-metal transition using a non-perturbative numerical approach. We map out the thermal phase diagram and provide quantitative estimates of the transition scales in an interacting altermagnet. We show that altermagnetism-induced geometric frustration stabilizes a finite-temperature correlated magnetic metal and enhances the magnetic transition scale across regimes of interaction. These results establish the finite-temperature landscape of correlated altermagnets and clarify the role of strong electronic interactions in this phase.