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Creation and characterization of vortex clusters in atomic Bose-Einstein condensates

Lookup NU author(s): Dr Angela White, Professor Carlo Barenghi, Professor Nikolaos ProukakisORCiD

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Abstract

We show that a moving obstacle, in the form of an elongated paddle, can create vortices that are dispersed or induce clusters of like-signed vortices in two-dimensional (2D) Bose-Einstein condensates. We propose statistical measures of clustering based on Ripley's K function which are suitable to the small size and small number of vortices in atomic condensates, which lack the huge number of length scales excited in larger classical and quantum turbulent fluid systems. The evolution and decay of clustering is analyzed using these measures. Experimentally it should prove possible to create such an obstacle by a laser beam and a moving optical mask. The theoretical techniques we present are accessible to experimentalists and extend the current methods available to induce 2D quantum turbulence in Bose-Einstein condensates.

Publication metadata

Author(s): White AC, Barenghi CF, Proukakis NP

Publication type: Article

Publication status: Published

Journal: Physical Review A

Year: 2012

Volume: 86

Issue: 1

Print publication date: 23/07/2012

Date deposited: 09/04/2014

ISSN (print): 1050-2947

ISSN (electronic): 0556-2791

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevA.86.013635

DOI: 10.1103/PhysRevA.86.013635

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