Superfluid flow past an obstacle in annular Bose–Einstein condensates

Syafwan, M, Kevrekidis, P, Paris-Mandoki, A, Lesanovsky, I, Krüger, P, Hackermüller, 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). p. 5301. ISSN 0953-4075

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We investigate the flow of a one-dimensional nonlinear Schrödinger 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
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Atomic, Molecular and Optical Physics Research Group
Subjects: Q Science > QC Physics
Depositing User: Richard Chambers
Date Deposited: 25 Jan 2017 10:12
Last Modified: 05 Nov 2017 02:00

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