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Abstract
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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 Poincaré space for the pseudospin
associated to the polariton states. The resulting
beam carries orbital angular momentum with decaying
oscillations due to the loss of spatial overlap between the
normal modes of the polariton system.
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