B\'enard-von K\'arm\'an vortex street in an exciton-polariton superfluid

TL;DR

This paper demonstrates the formation of a Bénard-von Kármán vortex street in an exciton-polariton superfluid, showing its robustness and potential observability in experiments, expanding understanding of superfluid vortex dynamics.

Contribution

It is the first numerical demonstration of a vortex street in an exciton-polariton superfluid, highlighting its stability and experimental detectability.

Findings

Vortex street forms behind an obstacle in the superfluid.

The vortex street persists despite disorder in the sample.

Vortex street can be observed in time-integrated measurements.

Abstract

The dynamics of an exciton--polariton superfluid resonantly injected into a semiconductor microcavity are investigated numerically. The results reveal that a B\'enard--von K\'arm\'an vortex street is generated in the wake behind an obstacle potential, in addition to the generation of quantized vortex dipoles and dark solitons. The vortex street is shown to be robust against a disorder potential in a sample and it can be observed even in time-integrated measurements.