Phonon-Induced Polariton Superlattices

Lima, M. M. de; Poel, Mike van der; Santos, P. V.; Hvam, Jørn Märcher

doi:10.1103/physrevlett.97.045501

Cited by 75 publications

(56 citation statements)

References 25 publications

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“…There is a well-resolved energy gap of about E gap = 180 μeV observed at the edge of the first mini-Brillouin zone (MBZ), at ±k SAW /2 = ±π/λ SAW , indicating the formation of a polariton lattice in the presence of the SAW. 28 To a first-order approximation, the value of this gap is equal to half the peakto-peak amplitude of the periodic potential V SAW induced by the acoustic wave. A further perturbation of the LP dispersion is observed at the edge of the second MBZ ± k SAW , where the band gap, due to spatial modulation, is significantly smaller.…”

Section: Polariton Excitations In Opo Condensatesmentioning

confidence: 99%

Effect of polariton-polariton interactions on the excitation spectrum of a nonequilibrium condensate in a periodic potential

et al. 2013

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Polariton condensates are investigated in periodical potentials created by surface acoustic waves (SAWs) using both coherent and incoherent optical excitation. Under coherent resonant pumping, condensates are formed due to polariton-parametric scattering from the pump. In this case, the excitation spectrum of the condensate shows a strong reduction of the energy gap arising from the acoustic modulation, indicating efficient screening of the SAW potential by spatial modulation of the polariton density. The observed results are in good agreement with a model based on generalized Gross-Pitaveskii equations, with account taken of the spatial dependence of the exciton energy landscape. In the case of incoherent pumping, coexisting nonequilibrium condensates with s-and p-type wavefunctions are observed, which have different energies, symmetry, and spatial coherence. The energy splitting between these condensate states is also reduced with respect to the gap of the one particle spectrum below threshold, but the screening effect is less pronounced than in the case of coherently pumped system due to weaker modulation of the pump state. Microcavity polaritons are composite particles arising from strong exciton-photon coupling in semiconductor microresonators. Due to their excitonic component, polariton-polariton interactions are very strong, enabling the observation of stimulated polariton-polariton scattering, 1,2 nonequilibrium-polariton Bose-Einstein condensation (BEC), 3-5 superfluidity, 6 and polariton solitons. 7,8 Polaritonpolariton interactions also define the size of vortices formed in polariton condensates 9 and modify the excitation spectrum of the condensates, leading to a diffusive Goldstone mode. 4,5,10 Recently, investigation of exciton-polaritons in a periodic potential became a topic in its own right. Study of the spatial coherence of nonequilibrium-polariton condensates arising from optical parametric oscillation (OPO) and condensate transport using surface acoustic wave (SAW) have been reported.11 Polariton condensation into p and d states under incoherent excitation has been observed in microcavities where weak one-dimensional (1D) and two-dimensional (2D) periodic potentials are created by metal patterning on the surface of microcavity.12,13 Furthermore, the formation of bright polariton solitons 14 in spatially modulated microcavity wires has been reported. 15 As well as exciton-polaritons, transport of indirect excitons in semiconductor quantum wells using SAWs 16 and electrode conveyor belts were also demonstrated. 17 We note that investigation of equilibrium cold atom condensates in periodic lattices has also been very productive with observation of superfluid-to-Mott insulator transition, 18 particle number squeezing, and bright gap solitons. 19Without the periodic potential, polariton-polariton interactions have been shown to determine the excitation spectrum of a condensate, which is a diffusive Goldstone mode 4,5,10,20 approaching a sound like Bogoliubov dispersion at higher k-vectors. Bogoliu...

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Section: Polariton Excitations In Opo Condensatesmentioning

confidence: 99%

Effect of polariton-polariton interactions on the excitation spectrum of a nonequilibrium condensate in a periodic potential

et al. 2013

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“…1(a)]. The potential patterning of a microcavity can be achieved by the variety of techniques, such as reaction ion etching 30 , mirror thickness variation 31 , stress application 32 , metal surface deposition 33,34 , surface acoustical waves 35 , or by optical means 36 . The idea to use a periodical potential for the diffraction management of matter waves has been suggested for the conventional Bose-Einstein condensates in atomic systems 37,38 .…”

Section: Introductionmentioning

confidence: 99%

Oscillatory dynamics of nonequilibrium dissipative exciton-polariton condensates in weak-contrast lattices

Chestnov

Charukhchyan

et al. 2015

Phys. Rev. B

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We study nonlinear dynamics of exciton-polaritons in an incoherently pumped semiconductor microcavity with embedded weak-contrast lattice and coupled to an exciton reservoir. We elucidate fundamental features of non-equilibrium exciton-polariton condensate trapped in one-dimensional periodical potential close to zero momentum (so-called 'Zero-state') and to the state at the boundary of Brillouin zone ('π-state'). Within the framework of the mean-field theory, we identify different regimes of both relaxation and oscillatory dynamics of coherent exciton-polaritons governed by superpositions of Bloch eigenstates within the periodic lattice. In particular, we theoretically demonstrate stable macroscopical oscillations, akin to nonlinear Josephson oscillations, between different spectral components of a polariton condensate in the momenta-space. We elucidate a strong influence of the dissipative effects and the feedback induced by the inhomogeneity of incoherent reservoir on the dynamics of the coherent polaritons.

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“…In this case one deals with an acoustically induced Autler-Townes effect, which gives rise to spectral gaps ⌬ N in the THz polariton spectrum of AW-driven TO phonons, and is akin to the acoustical Stark effect for optically allowed excitons. [9][10][11][12][13][14] The AW-induced gaps ⌬ N , which open up in the polariton spectrum and develop with increasing acoustic intensity I ac , are due to the Nth-order resonant acoustic-phonon transitions within the polariton dispersion branches. These forbidden-energy gaps strongly modify the optical response of TO-phonon polaritons and make possible the effective AW-controlled manipulation of the THz field.…”

Section: Introductionmentioning

confidence: 99%

Terahertz response of acoustically driven optical phonons

2010

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The manipulation of transverse-optical ͑TO͒-phonon polaritons and the associated terahertz ͑THz͒ light field by means of an ultrasound acoustic wave is proposed and illustrated by calculating the TO-phonon-mediated THz response of acoustically pumped CuCl and TlCl crystals. We show the high-contrast acoustically induced change in the THz reflectivity and multiple THz Bragg replicas, which are associated with the far-infraredactive TO-phonon resonance driven by the ultrasonic wave. The effect, which stems from phonon anharmonicity and deals with the resonantly enhanced acousto-optical susceptibilities, refers to an operating acoustic intensity I ac ϳ 1 -100 kW/ cm 2 and frequency ac ϳ 0.1-1 GHz. Due to the anomalously small interaction length between the acoustic and optical fields, possible applications of the effect are in THz spectroscopy and THz acousto-optic devices.

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Phonon-Induced Polariton Superlattices

Cited by 75 publications

References 25 publications

Effect of polariton-polariton interactions on the excitation spectrum of a nonequilibrium condensate in a periodic potential

Effect of polariton-polariton interactions on the excitation spectrum of a nonequilibrium condensate in a periodic potential

Oscillatory dynamics of nonequilibrium dissipative exciton-polariton condensates in weak-contrast lattices

Terahertz response of acoustically driven optical phonons

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