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Article Dans Une Revue EPL - Europhysics Letters Année : 2014

Evidence for a Bose-Einstein condensate of excitons

Mathieu Alloing
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Mussie Beian
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Maciej Lewenstein
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David Fuster
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Yolanda Gonzalez
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Luisa Gonzalez
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Résumé

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 (similar to 10(10) 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.

Dates et versions

hal-01229150 , version 1 (16-11-2015)

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Mathieu Alloing, Mussie Beian, Maciej Lewenstein, David Fuster, Yolanda Gonzalez, et al.. Evidence for a Bose-Einstein condensate of excitons. EPL - Europhysics Letters, 2014, 107 (1), pp.10012 ⟨10.1209/0295-5075/107/10012⟩. ⟨hal-01229150⟩
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