Physics – Condensed Matter – Superconductivity
Scientific paper
2007-10-16
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures
Scientific paper
10.1140/epjd/e2008-00060-0
We consider a Bose-Einstein condensate of ultracold atoms loaded into a square optical lattice and subject to a static force. For vanishing atom-atom interactions the atoms perform periodic Bloch oscillations for arbitrary direction of the force. We study the stability of these oscillations for non-vanishing interactions, which is shown to depend on an alignment of the force vector with respect to the lattice crystallographic axes. If the force is aligned along any of the axes, the mean field approach can be used to identify the stability conditions. On the contrary, for a misaligned force one has to employ the microscopic approach, which predicts periodic modulation of Bloch oscillations in the limit of a large forcing.
Chung Ming-Chiang
Kolovsky Andrey R.
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