Quarter-filled Kane-Mele Hubbard model: Dirac half-metals

TL;DR

This paper investigates the quarter-filled Kane-Mele Hubbard model, predicting the existence of Dirac half-metals that could host high-temperature quantum anomalous Hall effects, aiding the discovery of new 2D magnetic materials.

Contribution

It unifies the concept of Dirac half-metals with the Kane-Mele Hubbard model at quarter filling, providing theoretical predictions for intrinsic DHMs.

Findings

Identification of Dirac half-metals as realizations of the Kane-Mele Hubbard model at quarter filling

Prediction of high-temperature quantum anomalous Hall effect in these materials

Guidance for experimental discovery of new 2D magnetic DHM systems

Abstract

Recent experimental success in the realization of two-dimensional (2D) magnetism has stimulated the search for new magnetic 2D materials with strong magnetic anisotropy and high Curie temperature. One promising subgroup of 2D magnetic systems are Dirac half-metals (DHM) which have gained a lot of interest recently, as they host a high-temperature quantum anomalous Hall effect (QAHE). This article discusses predictions for intrinsic DHMs and identifies them as realizations of the Kane-Mele Hubbard model at quarter filling. This proposed unification contributes to a firmer understanding of these materials and suggests pathways for the discovery of new DHM systems.