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Controlled polarization of two-dimensional quantum turbulence in atomic Bose-Einstein condensates

Lookup NU author(s): Dr Luca Galantucci, Professor Carlo Barenghi

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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).

Abstract

We propose a scheme for generating two-dimensionalturbulence in harmonically trapped atomic condensateswith the novelty of controlling the polarization(net rotation) of theturbulence. Our scheme is based on an initial giant(multicharged) vortex which induces a large-scale circular flow.Two thin obstacles, created by blue-detunedlaser beams, speed up the decay of thegiant vortex into many singly-quantized vortices of thesame circulation; at the same time, vortex-antivortex pairs arecreated by the decaying circular flow past the obstacles.Rotation of the obstacles against the circular flowcontrols the relative proportion ofpositive and negative vortices, from the limit of stronglyanisotropic turbulence (almost all vortices having the same sign) tothat of isotropic turbulence (equal number of vortices andantivortices). Using the new scheme, we numerically study the decay of2D quantum turbulenceas a function of the polarization. Finally, we present amodel for the decay rate of the vortex number which fits our numericalexperiment curves, with the novelty of taking into account polarizationtime-dependence.

Publication metadata

Author(s): Cidrim A, dos Santos FEA, Galantucci L, Bagnato VS, Barenghi CF

Publication type: Article

Publication status: Published

Journal: Physical Review A

Year: 2016

Volume: 93

Issue: 3

Online publication date: 30/03/2016

Acceptance date: 18/01/2016

Date deposited: 27/04/2016

ISSN (print): 0556-2791

ISSN (electronic): 1094-1622

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevA.93.033651

DOI: 10.1103/PhysRevA.93.033651

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