Dynamics of a Polariton Condensate in an Organic Semiconducting Microcavity

TL;DR

This paper presents a theoretical study on the possibility of Bose-Einstein condensation of exciton-polaritons in organic semiconductor microcavities, showing conditions for superfluid states despite lattice disorder.

Contribution

It introduces a model for exciton-polariton condensates in organic thin films and analyzes the impact of lattice disorder on superfluid transition thresholds.

Findings

Superfluid transition remains sharp with up to 5% lattice disorder.

Organic semiconductors can support exciton-polariton BEC in microcavities.

Theoretical criteria for BEC in organic thin films are established.

Abstract

Recent experiments on thin-film microcavities give evidence of Bose condensation of exciton-polariton states. Inspired by these observations, we consider the possibility that such exotic "half-light/half matter" states could be observed in thin-film organic semiconductors where the oscillator strength is generally stronger than in inorganic systems. Here we present a theoretical model and simulations of macroscopic exciton-polartiton condensates in thracene thin films sandwiched within a micro-meter scale resonant cavity and establish criteria for the conditions under which BEC could be achieved in these systems. We consider the effect of lattice disorder on the threshold intensities necessary to create polartion superfluid states and conclude that even allowing for up to 5% angular disorder of the molecules within the crystal lattice, the superfluid transition remains sharp.