Spin noise of exciton-polaritons in microcavities

TL;DR

This paper presents a theoretical study of spin noise in exciton-polaritons within microcavities, revealing how spin fluctuations are influenced by system parameters and how they change during polariton lasing and condensation.

Contribution

It introduces a new theoretical framework for analyzing spin noise in exciton-polaritons, highlighting the effects of interactions, scattering, and condensation on spin fluctuations.

Findings

Spin noise spectrum narrows during polariton lasing.

Spin noise shape can become non-Lorentzian due to interactions.

Spin fluctuations are sensitive to scattering rates and occupation.

Abstract

We develop a theory of spin fluctuations of exciton-polaritons in a semiconductor microcavity under the non-resonant unpolarized pumping. It is shown that the corresponding spin noise is sensitive to the scattering rates in the system, occupation of the ground state, statistics of polaritons, and interactions. The spin noise spectrum drastically narrows in the polariton lasing regime due to formation of a polariton condensate, while its shape can become non-Lorentzian owing to interaction-induced spin decoherence.