Interaction of excitons with magnetic topological defects in 2D magnetic monolayers: localization and anomalous Hall effect

TL;DR

This paper explores how magnetic topological defects in 2D CrI3 monolayers influence exciton behavior, leading to phenomena like excitonic anomalous Hall effect and potential for tunable magnetoexcitonic quantum dots.

Contribution

It introduces the concept of exciton interactions with magnetic topological defects in 2D materials, revealing mechanisms for excitonic Hall effects and exciton localization.

Findings

Giant scattering asymmetry due to magnetic defects facilitates excitonic anomalous Hall effect.

Diamagnetic effects can localize excitons on skyrmions, enabling quantum dot formation.

Magnetic topological defects significantly impact exciton dynamics in 2D ferromagnets.

Abstract

Novel 2D material CrI3 reveals unique combination of 2D ferromagnetism and robust excitonic response. We demonstrate that the possibility of the formation of magnetic topological defects, such as Neel skyrmions, together with large excitonic Zeeman splitting, leads to giant scattering asymmetry, which is the necessary prerequisite for the excitonic anomalous Hall effect. In addition, the diamagnetic effect breaks the inversion symmetry, and in certain cases can result in exciton localization on the skyrmion. This enables the formation of magnetoexcitonic quantum dots with tunable parameters.