http://www.cnr.it/ontology/cnr/individuo/prodotto/ID179575

Collective fluid dynamics of a polariton condensate in a semiconductor microcavity (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Collective fluid dynamics of a polariton condensate in a semiconductor microcavity (Articolo in rivista) (literal)

Anno

2009-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1038/nature07640 (literal)

Alternative label

Amo, A; Sanvitto, D; Laussy, FP; Ballarini, D; del Valle, E; Martin, MD; Lemaitre, A; Bloch, J; Krizhanovskii, DN; Skolnick, MS; Tejedor, C; Vina, L (2009)
Collective fluid dynamics of a polariton condensate in a semiconductor microcavity
in Nature (Lond.); NATURE PUBLISHING GROUP,, LONDON (Regno Unito)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Amo, A; Sanvitto, D; Laussy, FP; Ballarini, D; del Valle, E; Martin, MD; Lemaitre, A; Bloch, J; Krizhanovskii, DN; Skolnick, MS; Tejedor, C; Vina, L (literal)

Pagina inizio

291 (literal)

Pagina fine

295 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://www.nature.com/nature/journal/v457/n7227/full/nature07640.html (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

457 (literal)

Rivista

Nature (Rivista)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Univ Autonoma Madrid, Dept Fis Mat, E-28049 Madrid, Spain; Univ Autonoma Madrid, Dept Fis Teor Mat Condensada, E-28049 Madrid, Spain; LPN CNRS, F-91460 Marcoussis, France; Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England (literal)

Titolo

Collective fluid dynamics of a polariton condensate in a semiconductor microcavity (literal)

Abstract

Semiconductor microcavities offer unique systems in which to investigate the physics of weakly interacting bosons. Their elementary excitations, polaritons--mixtures of excitons and photons--can accumulate in macroscopically degenerate states to form various types of condensate in a wide range of experimental configurations, under either incoherent1, 2 or coherent3, 4 excitation. Condensates of polaritons have been put forward as candidates for superfluidity5, 6, and the formation of vortices7 as well as elementary excitations with linear dispersion8 are actively sought as evidence to support this. Here, using a coherent excitation triggered by a short optical pulse, we have created and set in motion a macroscopically degenerate state of polaritons that can be made to collide with a variety of defects present in the microcavity. Our experiments show striking manifestations of a coherent light-matter packet, travelling at high speed (of the order of one per cent of the speed of light) and displaying collective dynamics consistent with superfluidity, although one of a highly unusual character as it involves an out-of-equilibrium dissipative system. Our main results are the observation of a linear polariton dispersion accompanied by diffusionless motion; flow without resistance when crossing an obstacle; suppression of Rayleigh scattering; and splitting into two fluids when the size of the obstacle is comparable to the size of the wave packet. This work opens the way to the investigation of new phenomenology of out-of-equilibrium condensates. (literal)

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