title: Injection of Orbital Angular Momentum and Storage of Quantized Vortices in Polariton Superfluids.
abstract: We report the experimental investigation and theoretical modeling of a rotating polariton superfluid relying on an innovative method for the injection of angular momentum. This novel, multipump injection method uses four coherent lasers arranged in a square, resonantly creating four polariton populations propagating inwards. The control available over the direction of propagation of the superflows allows injecting a controllable nonquantized amount of optical angular momentum. When the density at the center is low enough to neglect polariton-polariton interactions, optical singularities, associated with an interference pattern, are visible in the phase. In the superfluid regime resulting from the strong nonlinear polariton-polariton interaction, the interference pattern disappears and only vortices with the same sign are persisting in the system. Remarkably, the number of vortices inside the superfluid region can be controlled by controlling the angular momentum injected by the pumps.
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 4, place Jussieu Case 74, F-75005 Paris, France.
authors.forename: T
authors.initials: T
authors.lastname: Boulier
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom.
authors.forename: E
authors.initials: E
authors.lastname: Cancellieri
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 4, place Jussieu Case 74, F-75005 Paris, France.
authors.forename: N D
authors.initials: ND
authors.lastname: Sangouard
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 4, place Jussieu Case 74, F-75005 Paris, France.
authors.forename: Q
authors.initials: Q
authors.lastname: Glorieux
authors.affiliation: School of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom.|CNR-SPIN, Viale del Politecnico 1, Rome I-00133, Italy.
authors.forename: A V
authors.initials: AV
authors.lastname: Kavokin
authors.affiliation: Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom.
authors.forename: D M
authors.initials: DM
authors.lastname: Whittaker
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 4, place Jussieu Case 74, F-75005 Paris, France.
authors.forename: E
authors.initials: E
authors.lastname: Giacobino
authors.affiliation: Laboratoire Kastler Brossel, UPMC-Sorbonne Universités, CNRS, ENS-PSL Research University, Collège de France, 4, place Jussieu Case 74, F-75005 Paris, France.
authors.forename: A
authors.initials: A
authors.lastname: Bramati