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Kelvin-Helmholtz instability in two-component Bose gases on a lattice
Umeå University, Faculty of Science and Technology, Department of Physics.
2012 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 85, no 2, 023628- p.Article in journal (Refereed) Published
Abstract [en]

We explore the stability of the interface between two phase-separated Bose gases in relative motion on a lattice. Gross-Pitaevskii-Bogoliubov theory and the Gutzwiller ansatz are employed to study the short-and long-time stability properties. The underlying lattice introduces effects of discreteness, broken spatial symmetry, and strong correlations, all three of which are seen to have considerable qualitative effects on the Kelvin-Helmholtz instability. Discreteness is found to stabilize low flow velocities because of the finite energy associated with displacing the interface. Broken spatial symmetry introduces a dependence not only on the relative flow velocity but also on the absolute velocities. Strong correlations close to a Mott transition will stop the Kelvin-Helmholtz instability from affecting the bulk density and creating turbulence; instead, the instability will excite vortices with Mott-insulator-filled cores.

Place, publisher, year, edition, pages
2012. Vol. 85, no 2, 023628- p.
National Category
Physical Sciences
URN: urn:nbn:se:umu:diva-53258DOI: 10.1103/PhysRevA.85.023628ISI: 000300657100007OAI: diva2:511863
Available from: 2012-03-23 Created: 2012-03-19 Last updated: 2014-04-07Bibliographically approved

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Lundh, Emil
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