Dynamical formation of a strongly correlated dark condensate of dipolar excitons.

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ID: 66819
2019
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Ranked #234 of 292 articles by views in Proceedings of the National Academy of Sciences of the United States of America

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Abstract
Strongly interacting bosons display a rich variety of quantum phases, the study of which has so far been focused in the dilute regime, at a fixed number of particles. Here we demonstrate the formation of a dense Bose-Einstein condensate in a long-lived dark spin state of 2D dipolar excitons. A dark condensate of weakly interacting excitons is very fragile, being unstable against a coherent coupling of dark and bright spin states. Remarkably, we find that strong dipole-dipole interactions stabilize the dark condensate. As a result, the dark phase persists up to densities high enough for a dark quantum liquid to form. The striking experimental observation of a step-like dependence of the exciton density on the pump power is reproduced quantitatively by a model describing the nonequilibrium dynamics of driven coupled dark and bright condensates. This unique behavior marks a dynamical condensation to dark states with lifetimes as long as a millisecond, followed by a brightening transition at high densities.
Reference Key
mazuzharpaz2019dynamicalproceedings Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Mazuz-Harpaz, Yotam;Cohen, Kobi;Leveson, Michael;West, Ken;Pfeiffer, Loren;Khodas, Maxim;Rapaport, Ronen;
Journal Proceedings of the National Academy of Sciences of the United States of America
Year 2019
DOI
10.1073/pnas.1903374116
URL
Keywords
bose–einstein condensation indirect excitons quantum dipolar gases

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