Two-dimensional honeycomb-kagome V2O3: a robust room-temperature magnetic Chern insulator interfaced with graphene

TL;DR

This paper predicts a stable, room-temperature magnetic Chern insulator based on a single-layer V2O3 with honeycomb-kagome lattice, capable of supporting quantum anomalous Hall effect without external magnetic fields.

Contribution

It introduces a structurally stable V2O3 monolayer with large energy gap and Curie temperature, demonstrating potential for electronic and spintronic applications.

Findings

V2O3 monolayer is structurally stable with a honeycomb-kagome lattice.

Supports room-temperature quantum anomalous Hall effect due to spin-orbit coupling.

Robust against strain and compatible with graphene substrates.

Abstract

The possibility of dissipationless chiral edge states without the need of an external magnetic field in the quantum anomalous Hall effect (QAHE) offers a great potential in electronic/spintronic applications. The biggest hurdle for the realization of a room-temperature magnetic Chern insulator is to find a structurally stable material with a sufficiently large energy gap and Curie temperature that can be easily implemented in electronic devices. This work based on first-principle methods shows that a single atomic layer of V2O3 with honeycomb-kagome (HK) lattice is structurally stable with a spin-polarized Dirac cone which gives rise to a room-temperature QAHE by the existence of an atomic on-site spin-orbit coupling (SOC). Moreover, by a strain and substrate study, it was found that the quantum anomalous Hall system is robust against small deformations and can be supported by a graphene substrate.