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Excitation spectrum of a mixture of two Bose gases confined in a ring potential with interaction asymmetry
Department of Applied Mathematics, University of Crete, Heraklion, Greece.
Technological Education Institute of Crete, Heraklion, Greece.
Technological Education Institute of Crete, Heraklion, Greece.
Department of Applied Mathematics, University of Crete, Heraklion, Greece.
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2018 (English)In: New Journal of Physics, ISSN 1367-2630, E-ISSN 1367-2630, Vol. 20, article id 045006Article in journal (Refereed) Published
Abstract [en]

We study the rotational properties of a two-component Bose-Einstein condensed gas of distinguishable atoms which are confined in a ring potential using both the mean-field approximation, as well as the method of diagonalization of the many-body Hamiltonian. We demonstrate that the angular momentum may be given to the system either via single-particle, or "collective" excitation. Furthermore, despite the complexity of this problem, under rather typical conditions the dispersion relation takes a remarkably simple and regular form. Finally, we argue that under certain conditions the dispersion relation is determined via collective excitation. The corresponding many-body state, which, in addition to the interaction energy minimizes also the kinetic energy, is dictated by elementary number theory.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2018. Vol. 20, article id 045006
Keywords [en]
Bose-Einstein condensation; mixtures; superfluidity; vector solitons
National Category
Computational Mathematics Atom and Molecular Physics and Optics Condensed Matter Physics
Research subject
Physics; Mathematics
Identifiers
URN: urn:nbn:se:oru:diva-65601DOI: 10.1088/1367-2630/aab599ISI: 000430345700001OAI: oai:DiVA.org:oru-65601DiVA, id: diva2:1189023
Available from: 2018-03-09 Created: 2018-03-09 Last updated: 2018-05-02Bibliographically approved

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Sandin, PatrikÖgren, MagnusGulliksson, Mårten

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Computational MathematicsAtom and Molecular Physics and OpticsCondensed Matter Physics

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  • de-DE
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