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arXiv · 0812.0684

Photon-assisted tunneling in optical lattices: Ballistic transport of interacting boson pairs

Christoph Weiss·Heinz-Peter Breuer
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Abstract

In a recent experiment [PRL 100, 040404 (2008)] an analog of photon-assisted tunneling has been observed for a Bose-Einstein condensate in an optical lattice subject to a constant force plus a sinusoidal shaking. Contrary to previous theoretical predictions, the width of the condensate was measured to be proportional to the square of the effective tunneling matrix element, rather than a linear dependence. For a simple model of two interacting bosons in a one-dimensional optical lattice, both analytical and numerical calculations indicate that such a transition from a linear to a quadratic dependence can be interpreted through the ballistic transport and the corresponding exact dispersion relation of bound boson pairs.

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Christoph Weiss, Heinz-Peter Breuer. 2009-01-12. Photon-assisted tunneling in optical lattices: Ballistic transport of interacting boson pairs. https://doi.org/10.1103/physreva.79.023608

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