Quantized vortices in an exciton-polariton condensate

K. G. Lagoudakis, M. Wouters, M. Richard, A. Baas, I. Carusotto, R. Andre, Le Si Dang, B. Deveaud-Pledran

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Abstract

One of the most striking quantum effects in an interacting Bose gas at low temperature is superfluidity. First observed in liquid 4He, this phenomenon has been intensively studied in a variety of systems for its remarkable features such as the persistence of superflows and the proliferation of quantized vortices1. The achievement of Bose–Einstein condensation in dilute atomic gases2 provided the opportunity to observe and study superfluidity in an extremely clean and well-controlled environment. In the solid state, Bose–Einstein condensation of exciton polaritons has been reported recently3,4,5,6. Polaritons are strongly interacting light–matter quasiparticles that occur naturally in semiconductor microcavities in the strong-coupling regime and constitute an interesting example of composite bosons. Here, we report the observation of spontaneous formation of pinned quantized vortices in the Bose-condensed phase of a polariton fluid. Theoretical insight into the possible origin of such vortices is presented in terms of a generalized Gross–Pitaevskii equation. Whereas the observation of quantized vortices is, in itself, not sufficient for establishing the superfluid nature of the non-equilibrium polariton condensate, it suggests parallels between our system and conventional superfluids.
LanguageEnglish
Pages706-710
Number of pages5
JournalNature Physics
Volume4
Issue number9
DOIs
Publication statusPublished - 10 Aug 2008

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polaritons
condensates
excitons
vortices
superfluidity
condensation
bosons
solid state
composite materials
fluids
liquids
gases

Keywords

  • quantum effects
  • bose gas
  • exciton polariton condensates

Cite this

Lagoudakis, K. G., Wouters, M., Richard, M., Baas, A., Carusotto, I., Andre, R., ... Deveaud-Pledran, B. (2008). Quantized vortices in an exciton-polariton condensate. Nature Physics, 4(9), 706-710. https://doi.org/10.1038/nphys1051
Lagoudakis, K. G. ; Wouters, M. ; Richard, M. ; Baas, A. ; Carusotto, I. ; Andre, R. ; Dang, Le Si ; Deveaud-Pledran, B. / Quantized vortices in an exciton-polariton condensate. In: Nature Physics. 2008 ; Vol. 4, No. 9. pp. 706-710.
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Lagoudakis, KG, Wouters, M, Richard, M, Baas, A, Carusotto, I, Andre, R, Dang, LS & Deveaud-Pledran, B 2008, 'Quantized vortices in an exciton-polariton condensate' Nature Physics, vol. 4, no. 9, pp. 706-710. https://doi.org/10.1038/nphys1051

Quantized vortices in an exciton-polariton condensate. / Lagoudakis, K. G.; Wouters, M.; Richard, M.; Baas, A.; Carusotto, I.; Andre, R.; Dang, Le Si; Deveaud-Pledran, B.

In: Nature Physics, Vol. 4, No. 9, 10.08.2008, p. 706-710.

Research output: Contribution to journalArticle

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AB - One of the most striking quantum effects in an interacting Bose gas at low temperature is superfluidity. First observed in liquid 4He, this phenomenon has been intensively studied in a variety of systems for its remarkable features such as the persistence of superflows and the proliferation of quantized vortices1. The achievement of Bose–Einstein condensation in dilute atomic gases2 provided the opportunity to observe and study superfluidity in an extremely clean and well-controlled environment. In the solid state, Bose–Einstein condensation of exciton polaritons has been reported recently3,4,5,6. Polaritons are strongly interacting light–matter quasiparticles that occur naturally in semiconductor microcavities in the strong-coupling regime and constitute an interesting example of composite bosons. Here, we report the observation of spontaneous formation of pinned quantized vortices in the Bose-condensed phase of a polariton fluid. Theoretical insight into the possible origin of such vortices is presented in terms of a generalized Gross–Pitaevskii equation. Whereas the observation of quantized vortices is, in itself, not sufficient for establishing the superfluid nature of the non-equilibrium polariton condensate, it suggests parallels between our system and conventional superfluids.

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Lagoudakis KG, Wouters M, Richard M, Baas A, Carusotto I, Andre R et al. Quantized vortices in an exciton-polariton condensate. Nature Physics. 2008 Aug 10;4(9):706-710. https://doi.org/10.1038/nphys1051