Itinerant ferromagnetism in transition metal dichalcogenides moir\'e superlattices

TL;DR

This paper investigates the emergence of itinerant ferromagnetism in transition metal dichalcogenide moiré superlattices, predicting conditions for ferromagnetic order and high Curie temperatures using exact diagonalization.

Contribution

It introduces a theoretical analysis of ferromagnetism in moiré materials, identifying specific lattice conditions and temperature regimes for magnetic order.

Findings

Predicted ferromagnetism in triangular-lattice moiré systems.

Identified parameters for high Curie temperatures.

Mapped conditions favoring itinerant ferromagnetism.

Abstract

Moir\'e materials are artificial crystals formed at van der Waals heterojunctions that have emerged as a highly tunable platform to realize much of the rich quantum physics of electrons in atomic scale solids, also providing opportunities to discover new quantum phases of matter. Here we use finite-size exact diagonalization methods to explore the physics of single-band itinerant electron ferromagnetism in semiconductor moir\'e materials. We predict where ferromagnetism is likely to occur in triangular-lattice moir\'e systems, and where it is likely to yield the highest Curie temperatures.