Spiraling vortices in exciton-polariton condensates

Ma, Xuekai; Kartashov, Yaroslav V.; Gao, Tingge; Torner, Lluís; Schumacher, Stefan

doi:10.1103/physrevb.102.045309

Cited by 9 publications

(4 citation statements)

References 35 publications

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“…In atomic BEC, the loss of particles may cause vortices to spiral towards regions where they vanish [61,62]. Spiraling vortices have also been observed in non-equilibrium polariton BECs, such as those pumped by a broad super-Gaussian beam with a flat-top [63], as well as for continuous-wave pump [64]. In the present case of a circular beam P(r) = ηP th Θ(R p − r), spiraling vortices are discovered from the spiraling phase distributions.…”

Section: Dynamical Evolutionmentioning

confidence: 97%

Stability of vortices in exciton-polariton condensates with spin–orbital-angular-momentum coupling

Yang,

Zhang,

Niu

2024

New J. Phys.

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The existence and dynamics of stable quantized vortices is an important subject of quantum many-body physics. Spin-orbital-angular-momentum coupling (SOAMC), a special type of spin-orbit coupling, has been experimentally achieved to create vortices in atomic Bose-Einstein condensates (BEC). Here, we generalize the concept of SOAMC to a two-component polariton BEC and analyze the emergence and configuration of vortices under a finite-size circular pumping beam. We find that the regular configuration of vortex lattices induced by a finite-size circular pump is significantly distorted by the spatially dependent Raman coupling of SOAMC, even in the presence of a repulsive polariton interaction which can assist the forming of stable vortex configuration. Meanwhile, a pair of vortices induced by SOAMC located at the center of polariton cloud remains stable. When the Raman coupling is sufficiently strong and interaction is weak, the vortices spiraling in from the edge of polariton cloud will disrupt the polariton BEC.

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Section: Dynamical Evolutionmentioning

confidence: 97%

Stability of vortices in exciton-polariton condensates with spin–orbital-angular-momentum coupling

Yang,

Zhang,

Niu

2024

New J. Phys.

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“…A similar sequence of time delayed pulses has been used to shape nonlinear processes of high harmonic generation, resulting in a * a.rahmani.mir@gmail.com time-varying OAM 11 . Also, external potentials can generate rotating wavepackets; model examples are harmonic potential 12 and ring shaped potential 13,14 where the angular content is constant, or spiraling vortices can emerge from the sudden switch of a continuous-wave ring beam 15 .…”

Section: Introductionmentioning

confidence: 99%

Topologically driven Rabi-oscillating interference dislocation

Rahmani¹,

Colas²,

Воронова³

et al. 2022

Preprint

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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 overlap between the normal modes of the polariton system.

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“…As a consequence, using the natural filtering of the full-wavefunction offered by the cavity photoluminescence, rather than using a polarization filtering, the Bloch singularity was directly projected into the helicoidal dynamics of a vortex line sculpted into the light emission from the system. Full-Bloch beams hosting Rabi-spiraling vortices are also endowed with time-varying orbital angular momentum (OAM), similarly to those recently generated through nonlinear phenomena 51,52 . One way to understand such structured emission is in terms of the mechanics found by Nye and Berry 1,53 , who showed that photonic helical dislocations in 3D space can be ascribed to the superposition of straight vortex lines with, e.g., a tilted plane wave, and to their continuously varying relative phase, due to different wavevector directions.…”

Section: Introductionmentioning

confidence: 99%

Shaping the topology of light with a moving Rabi-oscillating vortex

Dominici,

Voronova,

Colas

et al. 2021

Preprint

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Quantum vortices are the analogue of classical vortices in optics, Bose-Einstein condensates, superfluids and superconductors, where they provide the elementary mode of rotation and orbital angular momentum. While they mediate important pair interactions and phase transitions in nonlinear fluids, their linear dynamics is useful for the shaping of complex light, as well as for topological entities in multi-component systems, such as full-Bloch beams. Here, setting a quantum vortex into directional motion in an open-dissipative fluid of microcavity polaritons, we observe the self-splitting of the packet, leading to the trembling movement of its center of mass, whereas the vortex core undergoes ultrafast spiraling along diverging and converging circles, in a sub-picosecond precessing fashion. This singular dynamics is accompanied by vortex-antivortex pairs creation and annihilation, and a periodically changing topological charge. The spiraling and branching mechanics represent a direct manifestation of the underlying Bloch pseudospin space, whose mapping is shown to be rotating and splitting itself. Its reshaping is due to three simultaneous drives along the distinct directions of momentum and complex frequency, by means of the differential group velocities, Rabi frequency and dissipation rates, which are natural assets in coupled fields such as polaritons. This state, displaying linear momentum dressed with oscillating angular momentum, confirms the richness of multi-component and open quantum fluids and their innate potentiality to implement sophisticated and dynamical topological textures of light, also going beyond pure homeomorphisms.

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Spiraling vortices in exciton-polariton condensates

Cited by 9 publications

References 35 publications

Stability of vortices in exciton-polariton condensates with spin–orbital-angular-momentum coupling

Stability of vortices in exciton-polariton condensates with spin–orbital-angular-momentum coupling

Topologically driven Rabi-oscillating interference dislocation

Shaping the topology of light with a moving Rabi-oscillating vortex

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