Interaction-enhanced flow of a polariton superfluid current in a ring

Year: 2018

Authors: Gallemì Camacho A., Guilleumas M., Richard M., Minguzzi A.

Autors Affiliation: [Gallemi, A.; Guilleumas, M.] Univ Barcelona, Dept Fis Quant & Astrofis, E-08028 Barcelona, Spain.
[Gallemi, A.] Univ Barcelona, Inst Nanociencia & Nanotecnol, E-08028 Barcelona, Spain and INO CNR BEC Ctr, I-38123 Povo, Italy and Univ Trent, Dipartimento Fis, I-38123 Povo, Italy.
[Guilleumas, M.] Univ Barcelona, Inst Ciencies Cosmos, E-08028 Barcelona, Spain.
[Richard, M.; Minguzzi, A.] Univ Grenoble Alpes, F-38000 Grenoble, France.
[Richard, M.] CNRS, Inst Neel, F-38000 Grenoble, France.
[Minguzzi, A.] CNRS, LPMMC, F-38000 Grenoble, France.

Abstract: We study the quantum hydrodynamical features of exciton polaritons flowing circularly in a ring-shaped geometry. We consider a resonant-excitation scheme in which the spinor polariton fluid is set into motion in both components by spin-to-orbital angular momentum conversion. We show that this scheme allows us to control the winding number of the fluid and to create two circulating states differing by two units of the angular momentum. We then consider the effect of a disorder potential, which is always present in realistic nanostructures. We discuss how a smooth disorder can be efficiently screened by the polariton-polariton interactions, yielding a signature of polariton superfluidity. This effect is reminiscent of supercurrent in a superconducting loop.


Volume: 98 (10)      Pages from: 104502-1  to: 104502-7

KeyWords: persistent currents; semiconductor microcavities; quantized vortices; condensate; single
DOI: 10.1103/PhysRevB.98.104502

Citations: 6
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