Exciton-polariton localized wave packets in a microcavity

Voronych, Oksana; Buraczewski, Adam; Matuszewski, Michał; Stobińska, Magdalena

doi:10.1103/physrevb.93.245310

Cited by 7 publications

(9 citation statements)

References 45 publications

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“…In this work we have studied a one-dimensional micro-wire and demonstrated the fundamental process of backward Cherenkov radiation by one-dimensional solitons. We anticipate a host of new polariton radiation physics in a system without lateral confinement, where the higher dimensionality and anisotropy of the polariton mass adds a wealth of additional effects, see, e.g., refs 54 , 55 . The experimentally measured and numerically modelled spatio-temporal patterns showing formation of the quasi-solitons and the backward Cherenkov radiation are in excellent qualitative agreement.…”

Section: Discussionmentioning

confidence: 99%

Backward Cherenkov radiation emitted by polariton solitons in a microcavity wire

et al. 2017

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Exciton-polaritons in semiconductor microcavities form a highly nonlinear platform to study a variety of effects interfacing optical, condensed matter, quantum and statistical physics. We show that the complex polariton patterns generated by picosecond pulses in microcavity wire waveguides can be understood as the Cherenkov radiation emitted by bright polariton solitons, which is enabled by the unique microcavity polariton dispersion, which has momentum intervals with positive and negative group velocities. Unlike in optical fibres and semiconductor waveguides, we observe that the microcavity wire Cherenkov radiation is predominantly emitted with negative group velocity and therefore propagates backwards relative to the propagation direction of the emitting soliton. We have developed a theory of the microcavity wire polariton solitons and of their Cherenkov radiation and conducted a series of experiments, where we have measured polariton-soliton pulse compression, pulse breaking and emission of the backward Cherenkov radiation.

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Section: Discussionmentioning

confidence: 99%

Backward Cherenkov radiation emitted by polariton solitons in a microcavity wire

et al. 2017

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“…The renewed interest in the XWs is also driven by their potential applicability in the field of atomic Bose-Einstein condensates (BEC) 11 and dissipative polariton condensates 12 . Both these systems bear deep similarity to the electromagnetic case because all these systems can be described by nonlinear Schrödinger equations 13,14 .…”

Section: Introductionmentioning

confidence: 99%

“…Both these systems bear deep similarity to the electromagnetic case because all these systems can be described by nonlinear Schrödinger equations 13,14 . Polariton XW solutions were predicted not only for microcavity polaritons 12 , but also in the case of Bragg polaritons, periodically embedding quantum wells directly into the multilayer stacks. 15 In both cases the XWs solutions rely on the locally hyperbolic dispersion (i.e., including both negative and positive curvatures).…”

Section: Introductionmentioning

confidence: 99%

Superluminal X-waves in a polariton quantum fluid

et al. 2017

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In this work, we experimentally demonstrate for the first time the spontaneous generation of two-dimensional exciton-polariton X-waves. X-waves belong to the family of localized packets that can sustain their shape without spreading, even in the linear regime. This allows the wavepacket to maintain its shape and size for very low densities and very long times compared to soliton waves, which always necessitate a nonlinearity to compensate the diffusion. Here, we exploit the polariton nonlinearity and uniquely structured dispersion, comprising both positive- and negative-mass curvatures, to trigger an asymmetric four-wave mixing in momentum space. This ultimately enables the self-formation of a spatial X-wave front. Using ultrafast imaging experiments, we observe the early reshaping of the initial Gaussian packet into the X-pulse and its propagation, even for vanishingly small densities. This allows us to outline the crucial effects and parameters that drive the phenomena and to tune the degree of superluminal propagation, which we found to be in close agreement with numerical simulations.

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“…Additionally, they can form localized nondiffracting X-waves [15,16] which could be used for transferring a classical signal between elements in the circuits. Thus, polaritonics is regarded as a future of new photonic-electronic devices, which will be capable of processing information at a rate of terabits per second and frequencies in the range 100 GHz-10 THz [17].…”

Section: Introductionmentioning

confidence: 99%

Numerical modeling of exciton–polariton Bose–Einstein condensate in a microcavity

Voronych

Buraczewski

Matuszewski

et al. 2017

Computer Physics Communications

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A novel, optimized numerical method of modeling of an exciton-polariton superfluid in a semiconductor microcavity was proposed. Exciton-polaritons are spin-carrying quasiparticles formed from photons strongly coupled to excitons. They possess unique properties, interesting from the point of view of fundamental research as well as numerous potential applications. However, their numerical modeling is challenging due to the structure of nonlinear differential equations describing their evolution. In this paper, we propose to solve the equations with a modified Runge-Kutta method of 4th order, further optimized for efficient computations. The algorithms were implemented in form of C++ programs fitted for parallel environments and utilizing vector instructions. The programs form the EPCGP suite which have been used for theoretical investigation of exciton-polaritons.Keywords: exciton-polariton superfluid; Bose-Einstein condensate; microcavity; Gross-Pitaevskii equation; Runge-Kutta method Nature of problem: An exciton-polariton superfluid is a novel, interesting physical system allowing investigation of high temperature Bose-Einstein condensation of exciton-polaritons-quasiparticles carrying spin. They have brought a lot of attention due to their unique properties and potential applications in polariton-based optoelectronic integrated circuits. This is an out-of-equilibrium quantum system confined within a semiconductor microcavity. It is described by a set of nonlinear differential equations similar in spirit to the Gross-Pitaevskii (GP) equation, but their unique properties do not allow standard GP solving frameworks to be utilized. Finding an accurate and efficient numerical algorithm as well as development of optimized numerical software is necessary for effective theoretical investigation of exciton-polaritons. Program summarySolution method: A Runge-Kutta method of 4th order was employed to solve the set of differential equations describing exciton-polariton superfluids. The method was fitted for the exciton-polariton equations and further optimized. The C++ programs utilize OpenMP extensions and vector operations in order to fully utilize the computer hardware.

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Exciton-polariton localized wave packets in a microcavity

Cited by 7 publications

References 45 publications

Backward Cherenkov radiation emitted by polariton solitons in a microcavity wire

Backward Cherenkov radiation emitted by polariton solitons in a microcavity wire

Superluminal X-waves in a polariton quantum fluid

Numerical modeling of exciton–polariton Bose–Einstein condensate in a microcavity

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