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

Dynamical and energetic instabilities in multicomponent Bose-Einstein condensates in optical lattices
Dynamical and energetic instabilities in multicomponent Bose-Einstein condensates in optical lattices
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.
1050-2947
063607-[16pp]
Ruostekoski, J.
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Dutton, Z.
6b4d7e81-3f55-4035-acb5-4b469f9a2c91
Ruostekoski, J.
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Dutton, Z.
6b4d7e81-3f55-4035-acb5-4b469f9a2c91

Ruostekoski, J. and Dutton, Z. (2007) Dynamical and energetic instabilities in multicomponent Bose-Einstein condensates in optical lattices. Physical Review A, 76 (6), 063607-[16pp]. (doi:10.1103/PhysRevA.76.063607).

Record type: Article

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.

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Published date: 10 December 2007

Identifiers

Local EPrints ID: 49970
URI: http://eprints.soton.ac.uk/id/eprint/49970
ISSN: 1050-2947
PURE UUID: 8d3df41f-0516-4db8-a18f-6f2c45d89136

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Date deposited: 08 Jan 2008
Last modified: 09 Nov 2021 09:16

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Contributors

Author: J. Ruostekoski
Author: Z. Dutton

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