Altermagnetism in an interacting model of Kagome materials

TL;DR

This paper demonstrates that Coulomb interactions in the Kagome Hubbard model induce altermagnetism at Dirac filling, revealing a new magnetic phase detectable via neutron scattering.

Contribution

It uncovers a novel interaction-driven altermagnetic phase in the Kagome Hubbard model without spin-orbit coupling or explicit symmetry breaking.

Findings

Altermagnetism arises from Coulomb interactions in the Kagome Hubbard model.

The altermagnetic phase exhibits characteristic magnon splitting.

Relevance to other lattices like Lieb-Kagome is discussed.

Abstract

The Hubbard model on the Kagome lattice is a widely used interacting model for describing the electronic properties of various transition metal-based Kagome materials. We find altermagnetism driven by Coulomb interaction in the Kagome Hubbard model at Dirac filling with no spin-orbit coupling nor explicit spatial symmetry breaking present. We show how this insulating altermagnet is relevant to other lattices with larger unit cells such as the Lieb-Kagome lattice. The ALM found displays a characteristic magnon splitting which can be detected in inelastic neutron scattering experiments on interacting Kagome materials.