Long-lifetime Polariton BEC in a Microcavity with an Embedded Quantum Well and Graphene

TL;DR

This paper models long-lifetime polariton Bose-Einstein condensates in microcavities with quantum wells or graphene, showing their potential for long-distance propagation and tunable optical applications.

Contribution

It demonstrates the feasibility of long-distance polariton BEC propagation in heterostructures with quantum wells or graphene, and predicts tunability via gap energy adjustments.

Findings

Polariton BEC can propagate up to 0.5 mm in these structures.

Higher dielectric constant microcavities support denser BEC at large distances.

Propagation can be dynamically tuned by changing the graphene gap energy.

Abstract

We study the propagation of a Bose-Einstein condensate (BEC) of long-lifetime exciton polaritons in a high-quality microcavity with an embedded semiconductor quantum well or a graphene layer using the Gross-Pitaevskii equation. It is shown that in these heterostructures the BEC of the long-lifetime polaritons can propagate over the distance up to 0.5 mm. The obtained results are consistent with the recent experimental observations for GaAs/AlGaAs microcavity. It is demonstrated that the BEC density in a polariton trace in a microcavity with embedded graphene at large distances from the excitation spot is higher for the microcavity with higher dielectric constant. It is also predicted that the propagation of a polariton BEC in a microcavity with graphene is dynamically tunable by changing the gap energy, that makes it potentially useful for applications in integrated optical circuits.