Generation and Dynamics of Vortex Lattices in Coherent Exciton-Polariton Fields

Liew, Timothy Chi Hin; Rubo, Yuri G.; Kavokin, A. V.

doi:10.1103/physrevlett.101.187401

Cited by 52 publications

(43 citation statements)

References 38 publications

(37 reference statements)

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“…The GP equations are widely used for the description of coherent propagation of exciton-polaritons in microcavities 46 . They allow for the studying of interesting topology effects such as: quantum vortices [47][48][49][50][51][52] ; halfquantum vortices [53][54][55] ; bright 56 and dark 51,57-60 solitons. The polarization of light emitted by an exciton or exciton-polariton condensate can be obtained as:…”

Section: Non-linear Spin Dynamics Of Propagating Excitons and Excmentioning

confidence: 99%

Ballistic spin transport in exciton gases

et al. 2013

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Traditional spintronics relies on spin transport by charge carriers, such as electrons in semiconductor crystals. The challenges for the realization of long-range electron spin transport include rapid spin relaxation due to electron scattering. Scattering and, in turn, spin relaxation can be effectively suppressed in excitonic devices where the spin currents are carried by electrically neutral bosonic quasi-particles: excitons or exciton-polaritons. They can form coherent quantum liquids that carry spins over macroscopic distances. The price to pay is a finite life-time of the bosonic spin carriers. We present the theory of exciton ballistic spin transport which may be applied to a range of systems supporting bosonic spin transport, in particular, to indirect excitons in coupled quantum wells. We describe the effect of spin-orbit interaction for the electron and the hole on the exciton spin, account for the Zeeman effect induced by external magnetic fields and long range and short range exchange splittings of the exciton resonances. We also consider exciton transport in the non-linear regime and discuss the definitions of the exciton spin current, polarization current and spin conductivity.

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Section: Non-linear Spin Dynamics Of Propagating Excitons and Excmentioning

confidence: 99%

Ballistic spin transport in exciton gases

et al. 2013

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“…Such models have been applied to vortex nucleation and motion, 17,[23][24][25][26] spatial density modulations, 15,27 solitons, 16,17,23 and vortex lattices. [28][29][30][31] Various different modifications of this model have been considered, such as including separate dynamics of the reservoir or modeling processes of thermal relaxation. Under the assumption of fast relaxation of the reservoir and small condensate densities these modifications all simplify, and the model can be written as…”

Section: Introductionmentioning

confidence: 99%

Robustness and observability of rotating vortex lattices in an exciton-polariton condensate

et al. 2012

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Exciton-polariton condensates display a variety of intriguing pattern-forming behaviors, particularly when confined in potential traps. It has previously been predicted that triangular lattices of vortices of the same sign will form spontaneously as the result of surface instabilities in a harmonic trap. However, natural disorder, deviation of the external potential from circular symmetry, or higher-order terms modifying the dynamical equations may all have detrimental effects and destabilize the circular trajectories of vortices. Here we address these issues by characterizing the robustness of the vortex lattice against disorder and deformations of the trapping potential. Since most experiments use time-integrated measurements, it would be hard to observe directly the rotating vortex lattices or distinguish them from vortex-free states. We suggest how these difficulties can be overcome and present an experimentally viable interference-imaging scheme that would allow the detection of rotating vortex lattices.

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“…However, no observation of the predicted 21 spontaneous regular distribution of vortices in a lattice has yet been reported. Being neutral systems, polariton condensates cannot produce vortex lattices in response to a magnetic field, but theoretical proposals suggest generating such lattices using harmonic traps 15 or resonant laser injection 22,23 .…”

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Geometrically locked vortex lattices in semiconductor quantum fluids

et al. 2012

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Macroscopic quantum states can be easily created and manipulated within semiconductor microcavity chips using exciton-photon quasiparticles called polaritons. Besides being a new platform for technology, polaritons have proven to be ideal systems to study out-of-equilibrium condensates. Here we harness the photonic component of such a semiconductor quantum fluid to measure its coherent wavefunction on macroscopic scales. Polaritons originating from separated and independent incoherently pumped spots are shown to phase-lock only in high-quality microcavities, producing up to 100 vortices and antivortices that extend over tens of microns across the sample and remain locked for many minutes. The resultant regular vortex lattices are highly sensitive to the optically imposed geometry, with modulational instabilities present only in square and not triangular lattices. Such systems describe the optical equivalents to one-and two-dimensional spin systems with (anti)-ferromagnetic interactions controlled by their symmetry, which can be reconfigured on the fly, paving the way to widespread applications in the control of quantum fluidic circuits.

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Generation and Dynamics of Vortex Lattices in Coherent Exciton-Polariton Fields

Cited by 52 publications

References 38 publications

Ballistic spin transport in exciton gases

Ballistic spin transport in exciton gases

Robustness and observability of rotating vortex lattices in an exciton-polariton condensate

Geometrically locked vortex lattices in semiconductor quantum fluids

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