title: Quantized Vortices and Four-Component Superfluidity of Semiconductor Excitons.
abstract: We study spatially indirect excitons of GaAs quantum wells, confined in a 10  μm 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.
authors.affiliation: Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, 4 Place Jussieu, F-75005 Paris, France.
authors.forename: Romain
authors.initials: R
authors.lastname: Anankine
authors.affiliation: Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, 4 Place Jussieu, F-75005 Paris, France.|ICFO-The Institute of Photonic Sciences, Av. Carl Friedrich Gauss, num. 3, 08860 Castelldefels, Spain.
authors.forename: Mussie
authors.initials: M
authors.lastname: Beian
authors.affiliation: Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, 4 Place Jussieu, F-75005 Paris, France.
authors.forename: Suzanne
authors.initials: S
authors.lastname: Dang
authors.affiliation: Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, 4 Place Jussieu, F-75005 Paris, France.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Alloing
authors.affiliation: Laboratoire de Photonique et Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis, France.
authors.forename: Edmond
authors.initials: E
authors.lastname: Cambril
authors.affiliation: Laboratoire de Photonique et Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis, France.
authors.forename: Kamel
authors.initials: K
authors.lastname: Merghem
authors.affiliation: Laboratoire de Photonique et Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis, France.
authors.forename: Carmen Gomez
authors.initials: CG
authors.lastname: Carbonell
authors.affiliation: Laboratoire de Photonique et Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis, France.
authors.forename: Aristide
authors.initials: A
authors.lastname: Lemaître
authors.affiliation: Sorbonne Universités, UPMC Univ. Paris 06, CNRS-UMR 7588, Institut des NanoSciences de Paris, 4 Place Jussieu, F-75005 Paris, France.
authors.forename: François
authors.initials: F
authors.lastname: Dubin