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Lookup NU author(s): Dr Luca Galantucci,
Professor Carlo Barenghi
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0).
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.
Author(s): Cidrim A, dos Santos FEA, Galantucci L, Bagnato VS, Barenghi CF
Publication type: Article
Publication status: Published
Journal: Physical Review A
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
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