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Vortex dynamics in coherently coupled Bose-Einstein condensates
University of Borås, Faculty of Librarianship, Information, Education and IT.ORCID iD: 0000-0002-1539-8256
2017 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 95, no 2, article id 023605Article in journal (Other academic) Published
Abstract [en]

In classical hydrodynamics with uniform density, vortices move with the local fluid velocity. This description is rewritten in terms of forces arising from the interaction with other vortices. Two such positive straight vortices experience a repulsive interaction and precess in a positive (anticlockwise) sense around their common centroid. A similar picture applies to vortices in a two-component two-dimensional uniform Bose-Einstein condensate (BEC) coherently coupled through rf Rabi fields. Unlike the classical case, however, the rf Rabi coupling induces an attractive interaction and two such vortices with positive signs now rotate in the negative (clockwise) sense. Pairs of counter-rotating vortices are instead found to translate with uniform velocity perpendicular to the line joining their cores. This picture is extended to a single vortex in a two-component trapped BEC. Although two uniform vortex-free components experience familiar Rabi oscillations of particle-number difference, such behavior is absent for a vortex in one component because of the nonuniform vortex phase. Instead the coherent Rabi coupling induces a periodic vorticity transfer between the two components.

Place, publisher, year, edition, pages
2017. Vol. 95, no 2, article id 023605
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:hb:diva-11647DOI: 10.1103/PhysRevA.95.023605Scopus ID: 2-s2.0-85012988646OAI: oai:DiVA.org:hb-11647DiVA, id: diva2:1062331
Available from: 2017-01-05 Created: 2017-01-05 Last updated: 2018-01-04Bibliographically approved

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