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Nonclassical Velocity Statistics in a Turbulent Atomic Bose-Einstein Condensate

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

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Abstract

In a recent experiment Paoletti et al. [Phys. Rev. Lett. 101, 154501 (2008)] monitored the motion of tracer particles in turbulent superfluid helium and inferred that the velocity components do not obey the Gaussian statistics observed in ordinary turbulence. Motivated by their experiment, we create a small 3D turbulent state in an atomic Bose-Einstein condensate, compute directly the velocity field, and find similar nonclassical power-law tails. We obtain similar results in 2D trapped and 3D homogeneous condensates, and in classical 2D vortex points systems. This suggests that non-Gaussian turbulent velocity statistics describe a fundamental property of quantum turbulence. We also track the decay of the vortex tangle in the presence of the thermal cloud.

Publication metadata

Author(s): White AC, Barenghi CF, Proukakis NP, Youd AJ, Wacks DH

Publication type: Article

Publication status: Published

Journal: Physical Review Letters

Year: 2010

Volume: 104

Issue: 7

Print publication date: 01/02/2010

ISSN (print): 0031-9007

ISSN (electronic): 1079-7114

Publisher: American Physical Society

URL: http://dx.doi.org/10.1103/PhysRevLett.104.075301

DOI: 10.1103/PhysRevLett.104.075301

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