Exciton localization on a magnetic domain wall in MoSe$_2$-CrI$_3$ heterostructure

TL;DR

This paper proposes a method to visualize magnetic domain walls in 2D magnetic materials by using TMD monolayers, where excitons are localized at the domain walls due to proximity effects, enabling nanoscale magnetic studies.

Contribution

It introduces a novel approach for direct visualization of magnetic domain walls in 2D magnets via exciton localization in TMD heterostructures, leveraging proximity-induced exchange effects.

Findings

Excitons are localized at magnetic domain walls in TMD heterostructures.

Proximity effects induce exchange mixing between spin-dark and spin-bright excitons.

This method enables nanoscale imaging of magnetic domain structures.

Abstract

The existence of spontaneous magnetization that fingerprints a ground-state ferromagnetic order was recently observed in two-dimensional (2D) van der Waals materials. Despite progress in the fabrication and manipulation of the atom-thick magnets, investigation of nanoscale magnetization properties is still challenging due to the concomitant technical issues. We propose a promising approach for a direct visualization of the domain walls formed in 2D magnetic materials. By interfacing 2D magnet with a transition metal dichalcogenide (TMD) monolayer, the strong proximity effects enable pinning the TMD excitons on the domain wall. The emergent localization stems from the proximity-induced exchange mixing between spin-dark and spin-bright TMD excitons due to the local in-plane magnetization characteristic of the domain wall in the magnetic monolayer.