Abstract
We study spatially indirect excitons of GaAs quantum wells, confined in a electrostatic trap. Below a critical temperature of about 1 K, we detect macroscopic spatial coherence and quantized vortices in the weak photoluminescence emitted from the trap. These quantum signatures are restricted to a narrow range of density, in a dilute regime. They manifest the formation of a four-component superfluid, made by a low population of optically bright excitons coherently coupled to a dominant fraction of optically dark excitons.
- Received 26 July 2016
- Publisher error corrected 24 March 2017
DOI:https://doi.org/10.1103/PhysRevLett.118.127402
© 2017 American Physical Society
Physics Subject Headings (PhySH)
Corrections
24 March 2017