Polariton parametric photoluminescence in spatially inhomogeneous systems

Sarchi, Davide; Wouters, Michiel; Savona, Vincenzo

doi:10.1103/physrevb.79.165315

Cited by 13 publications

(14 citation statements)

References 25 publications

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“…18, or by solving a nonequilibrium Schrödinger-type equation for the exciton-photon problem. 20,21 The spectrum of excitation, i.e., the frequencies and the lifetimes, obtained within the two approaches is substantially the same, with minor quantitative differences. This quantitative agreement makes the quasiparticle approximation suitable to describe the present nonequilibrium regime.…”

Section: A Polariton Quasimodesmentioning

confidence: 73%

Enhancement of microcavity polariton relaxation under confinement

et al. 2009

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We experimentally investigate the relaxation of spatially confined microcavity polaritons. We measure the time-and energy-resolved photoluminescence under resonant excitation and in the low-density regime. In this way, we have access to the time evolution of the energy distribution of the polariton population. We show that, when one confined level is resonantly excited, after an initial transient, the population of the confined levels is thermally distributed. The reported efficiency of the relaxation process strongly depends on the confinement size. These experimental findings are well reproduced by a theoretical model accounting for the coupling between the confined states and a bath of acoustic phonons. Our results thus suggest that the phonon-mediated relaxation mechanisms are enhanced in the presence of spatial confinement.

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Section: A Polariton Quasimodesmentioning

confidence: 73%

Enhancement of microcavity polariton relaxation under confinement

et al. 2009

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“…2 and 3 show, the experimental results presented here can be reproduced with a theoretical model which is described into more detail in Ref. 18. We start from the bosonic exciton-photon Hamiltonian 19,20 and we adopt a linearized mean-field approach.…”

mentioning

confidence: 66%

Coherent optical control of the wave function of zero-dimensional exciton polaritons

et al. 2009

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Control of the wave function of confined microcavity polaritons is demonstrated experimentally and theoretically by means of tailored resonant optical excitation. Three dimensional confinement is achieved by etching mesas on top of the microcavity spacer layer. Resonant excitation with a continuous-wave laser locks the phase of the discrete polariton states to the phase of the laser. By tuning the energy and momentum of the laser, we achieve precise control of the momentum pattern of the polariton wave function. This is an efficient and direct way for quantum control of electronic excitations in a solid.Polaritons in semiconductor microcavities are hybrid quasiparticles consisting of a superposition of photons and excitons. Due to their photon component, polaritons are characterized by a quantum coherence length in the several micron range. Owing to their exciton content, they display sizeable interactions, both mutual and with other electronic degrees of freedom. These unique features have produced striking matter wave phenomena, such as Bose-Einstein condensation, 1,2 or parametric processes 3,4 able to generate entangled polariton states. 5,6 The key feature of polaritons with respect to confinement is their very small effective mass, which is about 10 5 times smaller than the free-electron mass. Hence, confinement within micrometer sized traps is sufficient to produce an atomlike spectrum with discrete energy levels. Recently, several paradigms for spatial confinement of polaritons in semiconductor devices have been established. 7-10 This opens the way to quantum devices in which polaritons can be used as a vector of quantum information. 11 Their electronic component can be accessed and controlled optically, through their photonic component. This holds promise for preparation of quantum states, which might then be transferred to longer lived elements of quantum storage ͑e.g., localized spins͒, or as a mechanism for mediating interactions between such elements over long distances, as proposed in Ref. 12. Precise control of the polariton wave function is then an essential requirement.In this Rapid Communication we demonstrate the manipulation of the wave function of confined zero-dimensional ͑0D͒ exciton polaritons under resonant optical excitation. The excited wave functions are monitored by collecting the coherent emission from the polariton traps. Control of the spatial and momentum probability distribution of the confined polaritons is achieved by tuning either the incidence angle or the energy of the excitation beam. Our results are supported by numerical simulations based on the coupled Gross-Pitaevskii equations for excitons and photons.The sample we used to carry out our studies consists of a single quantum well embedded in a planar microcavity with a pattern of differently sized round mesas on the spacer layer. 13 Patterning the cavity thickness results in a modulation of the photon resonance energy, which corresponds to a potential trap, with finite-energy barriers, able to confine polaritons. The con...

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“…Such random forces model the incoherent non-resonant pumping of our system. Similar approaches were used to study optical emission of exciton-polaritons in Bragg multiple quantum well structures and for planar microcavities [20,[40][41][42].…”

Section: The Modelmentioning

confidence: 99%

Collective effects in emission of localized excitons strongly coupled to a microcavity photon

Poddubny¹,

Glazov²,

Averkiev³

2013

New J. Phys.

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A theory of nonlinear emission of localized excitons coupled to the optical mode of the microcavity is presented. Numerical results are compared with analytical ones. The effects of exciton-exciton interaction within the quantum dots and with the reservoir formed by non-resonant pumping are considered. It is demonstrated that the nonlinearity due to the interaction strongly affects the shape of the emission spectra. The collective superradiant mode of the excitons is shown to be stable against the nonlinear effects. 15 References 15

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Polariton parametric photoluminescence in spatially inhomogeneous systems

Cited by 13 publications

References 25 publications

Enhancement of microcavity polariton relaxation under confinement

Enhancement of microcavity polariton relaxation under confinement

Coherent optical control of the wave function of zero-dimensional exciton polaritons

Collective effects in emission of localized excitons strongly coupled to a microcavity photon

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