Magnetic field tuning of exciton polaritons in a semiconductor microcavity

TL;DR

This paper investigates how applying a magnetic field can tune exciton-polaritons in a semiconductor microcavity, affecting their energy, oscillator strength, and dispersion, with implications for controlling light-matter interactions.

Contribution

It demonstrates magnetic field control over exciton-polariton properties, including energy tuning, oscillator strength enhancement, and spin-dependent Zeeman effects, providing new insights for optoelectronic applications.

Findings

Magnetic field shifts exciton and polariton resonances.

Oscillator strength increases with magnetic field.

Zeeman splitting affects polariton spin components.

Abstract

We detail the influence of a magnetic field on exciton-polaritons inside a semiconductor microcavity. Magnetic field can be used as a tuning parameter for exciton and photon resonances. We discuss the change of the exciton energy, the oscillator strength and redistribution of the polariton density along the dispersion curves due to the magnetically-induced detuning. We have observed that field-induced shrinkage of the exciton wave function has a direct influence not only on the exciton oscillator strength, which is observed to increase with the magnetic field, but also on the polariton linewidth. We discuss the effect of the Zeeman splitting on polaritons which magnitude changes with the exciton Hopfield coefficient and can be modelled by independent coupling of the two spin components of excitons with cavity photons.