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Título: | Evidence for a Bose-Einstein condensate of excitons |
Autor: | Alloing, Mathieu; Beian, Mussie; Lewenstein, Maciej; Fuster, David CSIC ORCID ; González Díez, Yolanda CSIC ORCID; González Sotos, Luisa CSIC ORCID ; Combescot, Roland; Combescot, Monique; Dubin, François | Fecha de publicación: | 2014 | Editor: | Institute of Physics Publishing | Citación: | EPL - Europhysics Letters 107(1): 10012 (2014) | Resumen: | We report compelling evidence for a >gray> condensate of dipolar excitons, electrically polarised in a 25 nm wide GaAs quantum well. The condensate is composed by a macroscopic population of dark excitons coherently coupled to a lower population of bright excitons. To create the exciton condensate we use an all-optical approach in order to produce microscopic traps which confine a dense exciton gas (~ 1010 cm-2) that yet exhibits an anomalously weak photoemission at sub-kelvin temperatures. This is the first fingerprint for the >gray> condensate. It is then confirmed by the macroscopic spatial coherence and the linear polarization of the weak excitonic photoluminescence emitted from the trap, as theoretically predicted. Copyright © EPLA, 2014. | Versión del editor: | http://dx.doi.org/10.1209/0295-5075/107/10012 | URI: | http://hdl.handle.net/10261/103400 | DOI: | 10.1209/0295-5075/107/10012 | Identificadores: | e-issn: 1286-4854 issn: 0295-5075 |
Aparece en las colecciones: | (IMN-CNM) Artículos |
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