Damped Bloch Oscillations of Bose-Einstein Condensates in Disordered Potential Gradients

Details Damped Bloch Oscillations of Bose-Einstein Condensates in Disordered Potential Gradients Damped Bloch Oscillations of Bose-Einstein Condensates in Disordered Potential Gradients

2008-01-22

arxiv.org/abs/0801.3437v2

Physics

Condensed Matter

Other Condensed Matter

to be published in New Journal of Physics

Scientific paper

10.1088/1367-2630/10/4/045027

We investigate both experimentally and theoretically disorder induced damping of Bloch oscillations of Bose-Einstein condensates in optical lattices. The spatially inhomogeneous force responsible for the damping is realised by a combination of a disordered optical and a magnetic gradient potential. We show that the inhomogeneity of this force results in a broadening of the quasimomentum spectrum, which in turn causes damping of the centre-of-mass oscillation. We quantitatively compare the obtained damping rates to the simulations using the Gross-Pitaevskii equation. Our results are relevant for high precision experiments on very small forces, which require the observation of a large number of oscillation cycles.

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