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arXiv · 0801.3437

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

S. Drenkelforth·G. Kleine Büning·J. Will·T. Schulte·N. Murray·W. Ertmer·L. Santos·J. J. Arlt
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Abstract

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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S. Drenkelforth, G. Kleine Büning, J. Will, T. Schulte, N. Murray, W. Ertmer, L. Santos, J. J. Arlt. 2008-04-07. Damped Bloch Oscillations of Bose-Einstein Condensates in Disordered Potential Gradients. https://doi.org/10.1088/1367-2630%2F10%2F4%2F045027

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