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Kelvin-Helmholtz instability in two-component Bose gases on a lattice | | E. Lundh
; J.-P. Martikainen
; | | Date: |
9 Nov 2011 | | Abstract: | 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 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. | | Source: | arXiv, 1111.2175 | | Services: | Forum | Review | PDF | Favorites | |
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