Dynamical and energetic instabilities in multicomponent Bose-Einstein condensates in optical lattices

Ruostekoski, J. and Dutton, Z. (2007) Dynamical and energetic instabilities in multicomponent Bose-Einstein condensates in optical lattices. Physical review a, 76 (6). ISSN 1050-2947

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Abstract

We study dynamical and energetic instabilities in the transport properties of Bloch waves for atomic multicomponent Bose-Einstein condensates in optical lattices in the tight-binding limit. We obtain stability criteria analytically, as a function of superfluid velocities and interaction parameters, in several cases, for two-component and spinor condensates. In the two-species case we find that the presence of the other condensate component can stabilize the superfluid flow of an otherwise unstable condensate and that the free space dynamical miscibility condition of the two species can be reversed by tuning the superfluid flow velocities. In spin-1 condensates, we find the steady-state Bloch wave solutions and characterize their stability criteria. We find that generally more regions of dynamical instability arise for the polar than for the ferromagnetic solutions. In the presence of magnetic Zeeman shifts, we find a richer variety of condensate solutions and find that the linear Zeeman shift can stabilize the superfluid flow in several cases of interest.

Item Type:
Journal Article
Journal or Publication Title:
Physical review a
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3107
Subjects:
ID Code:
123678
Deposited By:
Deposited On:
26 Feb 2018 11:10
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Nov 2020 05:36