Angular dependence of giant Zeeman effect for semi-magnetic cavity polaritons

TL;DR

This paper demonstrates that incorporating magnetic ions into quantum wells within microcavities enhances the Zeeman effect on exciton-polaritons, with the splitting depending on detuning and wavevector, explained by a modified coupling model.

Contribution

It introduces a novel approach of embedding magnetic ions in quantum wells to amplify magnetic field effects on polaritons, revealing dependence on detuning and wavevector.

Findings

Zeeman splitting is significantly enhanced in magnetic ion-doped structures.

Splitting depends on photon-exciton detuning and polariton wavevector.

A model explains the effect as inherited from the excitonic component with modified coupling.

Abstract

The observation of spin-related phenomena of microcavity polaritons has been limited due to weak Zeeman effect of non-magnetic semiconductors. We demonstrate that the incorporation of magnetic ions into quantum wells placed in a non-magnetic microcavity results in enhanced effects of magnetic field on exciton-polaritons. We show that in such a structure the Zeeman splitting of exciton-polaritons strongly depends on the photon - exciton detuning and polariton wavevector. Our experimental data are explained by a model where the impact of magnetic field on the lower polariton state is directly inherited from the excitonic component, and the coupling strength to cavity photon is modified by external magnetic field.