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Coupling between Topological Excitations and the Background Sound Field in Atomic Bose-Einstein Condensates

Lookup NU author(s): Professor Nikolaos Proukakis, Professor Carlo Barenghi

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Abstract

Topological excitations in quantum fluids are coupled to the background sound field. This leads to a continuous exchange of energy between the two systems, as a result of which, the topological excitation can become deformed and its trajectory modified. These effects are considered in detail for dark solitons in trapped one-dimensional atomic Bose-Einstein condensates. The energy emitted by the dark soliton incident on a background potential gradient is shown to be proportional to the square of both the soliton deformation and the local soliton acceleration. Depending on the trap geometry, this energy can be partly or fully reabsorbed by the soliton, thus affecting its stability. The extension to vortices in trapped atomic condensates is discussed.


Publication metadata

Author(s): Proukakis NP, Parker NG, Barenghi CF, Adams CS

Publication type: Article

Publication status: Published

Journal: Laser Physics

Year: 2004

Volume: 14

Issue: 2

Pages: 284-290

ISSN (print): 1054-660X

ISSN (electronic): 1555-6611

Publisher: MAIK Nauka - Interperiodica


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