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Evidence for a Bose-Einstein condensate of excitons

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-01229150
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Submitted on : Monday, November 16, 2015 - 1:39:32 PM
Last modification on : Thursday, July 1, 2021 - 5:32:08 PM

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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, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2014, 107 (1), pp.10012 ⟨10.1209/0295-5075/107/10012⟩. ⟨hal-01229150⟩

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