Particle correlations and evidence for dark state condensation in a cold dipolar exciton fluid

Abstract

In this paper we show experimental evidence of a few correlation regimes of a cold dipolar exciton fluid, created optically in a semiconductor bilayer heterostructure. In the higher temperature regime, the average interaction energy between the particles shows a surprising temperature dependence which is an evidence for correlations beyond the mean field model. At a lower temperature, there is a sharp increase in the interaction energy of optically active excitons, accompanied by a strong reduction in their apparent population. This is an evidence for a sharp macroscopic transition to a dark state as was suggested theoretically.

References in corpus (6)

• Many-Body Physics with Ultracold Gases
• Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
• Quantum phase transition in a two-dimensional system of dipoles
• Analysis of the exciton-exciton interaction in semiconductor quantum wells
• Analysis of Trapped Quantum Degenerate Dipolar Excitons
• Observation of macroscopic coherence in self-organized dipolar excitons

Cited by in corpus (47)

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• Radiative lifetimes of dipolar excitons in double quantum-wells
• Theory of condensation of indirect excitons in a trap
• Coherent transport and manipulation of spins in indirect exciton nanostructures
• Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons
• Fluctuation and Commensurability Effect of Exciton Density Wave
• High-mobility indirect excitons in wide single quantum well
• Defect-Driven Superfluid Crossover for Two-Dimensional Dipolar Excitons Trapped at Thermodynamic Equilibrium
• Confocal shift interferometry of coherent emission from trapped dipolar excitons
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• Optical signatures of a fully dark exciton condensate
• Optical signature of quantum coherence in fully dark exciton condensates
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• Giant Hyperfine Interaction between a Dark Exciton Condensate and Nuclei