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

doi:10.1103/PhysRevB.80.045317

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

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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.

Original language	English
Article number	045317
Number of pages	9
Journal	Physical Review B
Volume	80
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevB.80.045317
Publication status	Published - 15 Jul 2009

Keywords

theoretical model
nonequilibrium condensates
microcavity polariton emission

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10.1103/PhysRevB.80.045317

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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, L. S. (2009). Coexisting nonequilibrium condensates with long-range spatial coherence in semiconductor microcavities. Physical Review B, 80(4), Article 045317. https://doi.org/10.1103/PhysRevB.80.045317

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title = "Coexisting nonequilibrium condensates with long-range spatial coherence in semiconductor microcavities",

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.",

keywords = " theoretical model, nonequilibrium condensates, microcavity polariton emission",

author = "Krizhanovskii, {D. N.} and Lagoudakis, {K. G.} and M. Wouters and B. Pietka and Bradley, {R. A.} and K. Guda and Whittaker, {D. M.} and Skolnick, {M. S.} and B. Deveaud-Pl{\'e}dran and M. Richard and R. Andr{\'e} and Dang, {Le Si}",

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doi = "10.1103/PhysRevB.80.045317",

language = "English",

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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

PY - 2009/7/15

Y1 - 2009/7/15

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.

KW - theoretical model

KW - nonequilibrium condensates

KW - microcavity polariton emission

UR - https://journals.aps.org/prb/

U2 - 10.1103/PhysRevB.80.045317

DO - 10.1103/PhysRevB.80.045317

M3 - Article

SN - 2469-9950

VL - 80

JO - Physical Review B

JF - Physical Review B

IS - 4

M1 - 045317

ER -

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

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