Optical signatures of a fully dark exciton condensate

Abstract

We propose optical means to reveal the presence of a dark exciton condensate that does not yield any photoluminescence at all. We show that (i) the dark exciton density can be obtained from the blueshift of the excitonic absorption line induced by dark excitons; (ii) the polarization of the dark condensate can be deduced from the blueshift dependence on probe photon polarization and also from Faraday effect, linearly polarized dark excitons leaving unaffected the polarization plane of an unabsorbed photon beam. These effects result from carrier exchanges between dark and bright excitons.

5 pages, 4 figures

References in corpus (2)

• Particle correlations and evidence for dark state condensation in a cold dipolar exciton fluid
• Collection of indirect excitons in a diamond-shaped electrostatic trap

Cited by in corpus (5)

• Spontaneous coherence in spatially extended photonic systems: Non-Equilibrium Bose-Einstein condensation
• Leaky exciton condensates in transition metal dichalcogenide moiré bilayers
• Roton-maxon spectrum and instability for weakly interacting dipolar excitons in a semiconductor layer
• Nonlinear Optical Probe of Indirect Excitons
• Anomalous Exciton Hall Effect