# Magnetic Proximity Effects in Transition-Metal Dichalcogenides: Converting Excitons

## TL;DR

This paper explores how magnetic proximity effects influence excitons in monolayer transition-metal dichalcogenides, revealing a mechanism to convert between optically active and inactive excitons through magnetization rotation, with potential for experimental verification.

## Contribution

It demonstrates that magnetic proximity effects in TMD heterostructures can induce exciton conversion, which cannot be explained by single-particle models, highlighting a new optical response mechanism.

## Key findings

- Proximity effects enable conversion between optically inactive and active excitons.
- Magnetization rotation can modulate excitonic optical properties.
- Theoretical predictions are testable with recent magnetic TMD heterostructure fabrication.

## Abstract

The two-dimensional character and reduced screening in monolayer transition-metal dichalcogenides (TMDs) lead to the ubiquitous formation of robust excitons with binding energies orders of magnitude larger than in bulk semiconductors. Focusing on neutral excitons, bound electron-hole pairs, that dominate the optical response in TMDs, it is shown that they can provide fingerprints for magnetic proximity effects in magnetic heterostructures. These proximity effects cannot be described by the widely used single-particle description, but instead reveal the possibility of a conversion between optically inactive and active excitons by rotating the magnetization of the magnetic substrate. With recent breakthroughs in fabricating Mo- and W-based magnetic TMD-heterostructures, this emergent optical response can be directly tested experimentally.