Topologically driven Rabi-oscillating interference dislocation

TL;DR

This paper theoretically investigates the dynamics of interference dislocations in strongly coupled light-matter systems, revealing how Rabi oscillations influence vortex behavior and orbital angular momentum in microcavity polaritons.

Contribution

It introduces a novel analysis of interference dislocation propagation in strongly coupled polariton systems, highlighting the role of Rabi oscillations and non-parabolic dispersion.

Findings

Dislocations originate from self-interference fringes.

Vortex morphology analyzed in Poincaré space.

Beam carries orbital angular momentum with decaying oscillations.

Abstract

Quantum vortices are the quantized version of classical vortices. Their center is a phase singularity or vortex core around which the flow of particles as a whole circulates and is typical in superfluids, condensates and optical fields. However, the exploration of the motion of the phase singularities in coherently-coupled systems is still underway. We theoretically analyze the propagation of an interference dislocation in the regime of strong coupling between light and matter, with strong mass imbalance, corresponding to the case of microcavity exciton-polaritons. To this end, we utilize combinations of vortex and tightly focused Gaussian beams, which are introduced through resonant pulsed pumping. We show that a dislocation originates from self-interference fringes, due to the non-parabolic dispersion of polaritons combined with moving Rabi-oscillating vortices. The morphology of singularities is analyzed in the Poincar\'{e} space for the pseudospin associated to the polariton states. The resulting beam carries orbital angular momentum with decaying oscillations due to the loss of overlap between the normal modes of the polariton system.