Coexisting nonequilibrium condensates with long-range spatial coherence in semiconductor microcavities

D. N. Krizhanovskii, K. G. Lagoudakis, M. Wouters, B. Pietka, R. A. Bradley, K. Guda, D. M. Whittaker, M. S. Skolnick, B. Deveaud-Plédran, M. Richard, R. André, Le Si Dang

Research output: Contribution to journalArticle

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Abstract

Real- and momentum-space spectrally resolved images of microcavity polariton emission in the regime of condensation are investigated under nonresonant excitation using a laser source with reduced intensity fluctuations on the time scale of the exciton lifetime. We observe that the polariton emission consists of many macroscopically occupied modes. Lower-energy modes are strongly localized by the spatial polaritonic potential disorder on a scale of a few microns. Higher-energy modes have finite k vectors and are delocalized over 10–15 μm. All the modes exhibit long-range spatial coherence comparable to their size. We provide a theoretical model describing the behavior of the system with the results of the simulations in good agreement with the experimental observations. We show that the multimode emission of the polariton condensate is a result of its nonequilibrium character, the interaction with the local polaritonic potential, and the reduced intensity fluctuations of the excitation laser.
LanguageEnglish
Article number045317
Number of pages9
JournalPhysical Review B
Volume80
Issue number4
DOIs
Publication statusPublished - 15 Jul 2009

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condensates
polaritons
excitation
lasers
condensation
excitons
disorders
momentum
life (durability)
energy
simulation
interactions

Keywords

  • theoretical model
  • nonequilibrium condensates
  • microcavity polariton emission

Cite this

Krizhanovskii, D. N. ; Lagoudakis, K. G. ; Wouters, M. ; Pietka, B. ; Bradley, R. A. ; Guda, K. ; Whittaker, D. M. ; Skolnick, M. S. ; Deveaud-Plédran, B. ; Richard, M. ; André, R. ; Dang, Le Si. / Coexisting nonequilibrium condensates with long-range spatial coherence in semiconductor microcavities. In: Physical Review B. 2009 ; Vol. 80, No. 4.
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abstract = "Real- and momentum-space spectrally resolved images of microcavity polariton emission in the regime of condensation are investigated under nonresonant excitation using a laser source with reduced intensity fluctuations on the time scale of the exciton lifetime. We observe that the polariton emission consists of many macroscopically occupied modes. Lower-energy modes are strongly localized by the spatial polaritonic potential disorder on a scale of a few microns. Higher-energy modes have finite k vectors and are delocalized over 10–15 μm. All the modes exhibit long-range spatial coherence comparable to their size. We provide a theoretical model describing the behavior of the system with the results of the simulations in good agreement with the experimental observations. We show that the multimode emission of the polariton condensate is a result of its nonequilibrium character, the interaction with the local polaritonic potential, and the reduced intensity fluctuations of the excitation laser.",
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Krizhanovskii, DN, Lagoudakis, KG, Wouters, M, Pietka, B, Bradley, RA, Guda, K, Whittaker, DM, Skolnick, MS, Deveaud-Plédran, B, Richard, M, André, R & Dang, LS 2009, 'Coexisting nonequilibrium condensates with long-range spatial coherence in semiconductor microcavities' Physical Review B, vol. 80, no. 4, 045317. https://doi.org/10.1103/PhysRevB.80.045317

Coexisting nonequilibrium condensates with long-range spatial coherence in semiconductor microcavities. / Krizhanovskii, D. N.; Lagoudakis, K. G.; Wouters, M.; Pietka, B.; Bradley, R. A.; Guda, K.; Whittaker, D. M.; Skolnick, M. S.; Deveaud-Plédran, B.; Richard, M.; André, R.; Dang, Le Si.

In: Physical Review B, Vol. 80, No. 4, 045317, 15.07.2009.

Research output: Contribution to journalArticle

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T1 - Coexisting nonequilibrium condensates with long-range spatial coherence in semiconductor microcavities

AU - Krizhanovskii, D. N.

AU - Lagoudakis, K. G.

AU - Wouters, M.

AU - Pietka, B.

AU - Bradley, R. A.

AU - Guda, K.

AU - Whittaker, D. M.

AU - Skolnick, M. S.

AU - Deveaud-Plédran, B.

AU - Richard, M.

AU - André, R.

AU - Dang, Le Si

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N2 - Real- and momentum-space spectrally resolved images of microcavity polariton emission in the regime of condensation are investigated under nonresonant excitation using a laser source with reduced intensity fluctuations on the time scale of the exciton lifetime. We observe that the polariton emission consists of many macroscopically occupied modes. Lower-energy modes are strongly localized by the spatial polaritonic potential disorder on a scale of a few microns. Higher-energy modes have finite k vectors and are delocalized over 10–15 μm. All the modes exhibit long-range spatial coherence comparable to their size. We provide a theoretical model describing the behavior of the system with the results of the simulations in good agreement with the experimental observations. We show that the multimode emission of the polariton condensate is a result of its nonequilibrium character, the interaction with the local polaritonic potential, and the reduced intensity fluctuations of the excitation laser.

AB - Real- and momentum-space spectrally resolved images of microcavity polariton emission in the regime of condensation are investigated under nonresonant excitation using a laser source with reduced intensity fluctuations on the time scale of the exciton lifetime. We observe that the polariton emission consists of many macroscopically occupied modes. Lower-energy modes are strongly localized by the spatial polaritonic potential disorder on a scale of a few microns. Higher-energy modes have finite k vectors and are delocalized over 10–15 μm. All the modes exhibit long-range spatial coherence comparable to their size. We provide a theoretical model describing the behavior of the system with the results of the simulations in good agreement with the experimental observations. We show that the multimode emission of the polariton condensate is a result of its nonequilibrium character, the interaction with the local polaritonic potential, and the reduced intensity fluctuations of the excitation laser.

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