Effective interaction and condensation of dipolaritons in coupled quantum wells

TL;DR

This paper provides a theoretical framework for understanding dipolaritons in coupled quantum wells, deriving their interactions and conditions for condensation, highlighting the limited tunability of their interactions.

Contribution

It introduces a simple theoretical model for dipolariton interactions, including exchange effects, and predicts their condensation behavior using a dissipative Gross-Pitaevskii equation.

Findings

Derived formulas for dipolariton parameters

Established a relation for low-density interactions

Predicted conditions for dipolariton condensation

Abstract

Dipolaritons are a three-way superposition of photon, a direct exciton, and an indirect exciton that are formed in coupled quantum well microcavities. As is the case with exciton-polaritons, dipolaritons have a self-interaction due to direct and exchange effects of the underlying electrons and holes. Here we present a theoretical description of dipolaritons and derive simple formulas for their basic parameters. In particular, we derive the effective dipolariton-dipolariton interaction taking into account of exchange effects between the excitons. We obtain a simple relation to describe the effective interaction at low densities. We find that dipolaritons should condense under suitable conditions, described by a dissipative Gross-Pitaevskii equation. While the parameters for condensation are promising, we find that the level of tunability of the interactions is limited.