Linewidth of a polariton laser: Theoretical analysis of self-interaction effects

TL;DR

This paper provides a theoretical analysis of how self-interaction affects the linewidth of emission from a polariton laser, revealing an optimal pump level for minimal linewidth in CdTe microcavities.

Contribution

It introduces a theoretical model specifically analyzing self-interaction effects on polariton laser linewidth, highlighting an optimal pump condition for coherence.

Findings

Linewidth can be reduced to 1 μeV at optimal pump levels.

Self-interaction influences phase diffusion and coherence.

The analysis is specific to CdTe microcavities.

Abstract

Polaritons in semiconductor microcavities can experience a Bose-Einstein condensation experimentally detectable in the spectrum of the emitted light. Scattering with noncondensed particles as well as self-interaction in the condensate provoke phase-diffusion limiting the coherence of the polariton condensate. We present a theoretical analysis of self-interaction effects on the lineshape of the emission from a polariton laser. Our calculations, for CdTe microcavities, show that there is an optimum pump at which the linewidth of the emitted light is reduced down to 1 $\mu$ eV.