Frequency combs with weakly lasing exciton-polariton condensates

TL;DR

This paper predicts that coupled exciton-polariton condensates can spontaneously generate complex, self-induced oscillations and produce equidistant frequency comb spectra, influenced by interactions, symmetry breaking, and noise.

Contribution

It introduces a theoretical model showing how weakly lasing polariton condensates can produce frequency combs through complex dynamics and symmetry breaking, extending understanding of polariton lasing behavior.

Findings

Condensates exhibit self-induced oscillations and frequency comb emission.

Complex emission spectra with asymmetric peaks due to broken time-reversal symmetry.

Shot noise causes inhomogeneous line broadening in the emission spectra.

Abstract

We predict the spontaneous modulated emission from a pair of exciton-polariton condensates due to coherent (Josephson) and dissipative coupling. We show that strong polariton-polariton inter- action generates complex dynamics in the weak-lasing domain way beyond Hopf bifurcations. As a result, the exciton-polariton condensates exhibit self-induced oscillations and emit an equidistant frequency comb light spectrum. A plethora of possible emission spectra with asymmetric peak dis- tributions appears due to spontaneously broken time-reversal symmetry. The lasing dynamics is affected by the shot noise arising from the influx of polaritons. That results in a complex inhomo- geneous line broadening.