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We study spatially indirect excitons of GaAs quantum wells, confined in a 10microns electrostatic trap. Below a critical temperature of about 1 Kelvin, wedetect macroscopic spatial coherence and quantised vortices in the weakphotoluminescence emitted from the trap. These quantum signatures arerestricted to a narrow range of density, in a dilute regime. They manifest theformation of a four-component superfluid, made by a low population of opticallybright excitons coherently coupled to a dominant fraction of optically darkexcitons.

Quantized Vortices and Four-Component Superfluidity of Semiconductor Excitons