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Title: Bound states of dark solitons and vortices in trapped multidimensional Bose-Einstein condensates
Author: Morera Navarro, I.
Guilleumas, M.
Mayol, R.
Muñoz Mateo, A.
Keywords: Condensació de Bose-Einstein
Bose-Einstein condensation
Issue Date: 12-Oct-2018
Publisher: American Physical Society
Abstract: We report on the existence and stability of multidimensional bound solitonic states in harmonically trapped scalar Bose-Einstein condensates. Their equilibrium separation, as a measure of the strength of the soliton- soliton or the solitonic vortex-vortex interaction, is provided for varying chemical potential μ. Static bound dark solitons are shown to be dynamically stable in elongated condensates within a range of intermediate (repulsive) interparticle-interaction strength. Beyond this range the snaking instability manifests during the time evolution of the planar solitons and produces the decay into nonstationary vortex states. A subsequent dynamical recurrence of solitons and vortices can be observed at low μ. At equilibrium, the bifurcations of bound dark solitons are bound solitonic vortices. Among them, both two-open and two-ring vortex lines are demonstrated to exist with both counter- and co-rotating steady velocity fields. The latter flow configurations evolve, for high chemical potential, into a stationary three-dimensional (3D)-chain-shaped vortex and a three vortex-antivortex-vortex ring sequence that arrest the otherwise increasing angular or linear momentum respectively. As a feature common to the bifurcated families of vortex states, their excitation spectra present unstable modes with associated oscillatory dynamics. In spite of this, the family of two-open counter-rotating vortices support dynamically stable 3D states.
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It is part of: Physical Review A, 2018, vol. 98, p. 043612
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ISSN: 2469-9926
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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