Superfluid flow past an obstacle in annular Bose–Einstein condensates

Syafwan, M. and Kevrekidis, P. and Paris-Mandoki, A. and Lesanovsky, I. and Kruger, Peter and Hackermuller, L. and Susanto, H. (2016) Superfluid flow past an obstacle in annular Bose–Einstein condensates. Journal of Physics B: Atomic, Molecular and Optical Physics, 49 (23). 235301/1-235301/8. ISSN 1361-6455

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Abstract

We investigate the flow of a one-dimensional nonlinear Schroedinger model with periodic boundary conditions past an obstacle, motivated by recent experiments with Bose-Einstein condensates in ring traps. Above certain rotation velocities, localized solutions with a nontrivial phase profile appear. In striking difference from the infinite domain, in this case there are many critical velocities. At each critical velocity, the steady flow solutions disappear in a saddle-center bifurcation. These interconnected branches of the bifurcation diagram lead to additions of circulation quanta to the phase of the associated solution. This, in turn, relates to the manifestation of persistent current in numerous recent experimental and theoretical works, the connections to which we touch upon. The complex dynamics of the identified waveforms and the instability of unstable solution branches are demonstrated.

Item Type: Article
Additional Information: This is an author-created, un-copyedited version of an article accepted for publication in Journal of Physics B: Atomic, Molecular and Optical Physics. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at http://dx.doi.org/10.1088/0953-4075/49/23/235301
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number: 10.1088/0953-4075/49/23/235301
Depositing User: Hackermuller, Lucia
Date Deposited: 21 Dec 2016 09:57
Last Modified: 04 Nov 2017 17:36
URI: http://eprints.nottingham.ac.uk/id/eprint/39468

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