2008/12/31 by Christoph Weiss, Heinz-Peter Breuer
Physics and Astronomy · #cond-mat.other
paper · pdf · doi:10.1103/physreva.79.023608
published as Physical Review A: Atomic, Molecular and Optical Physics 79, 2 (2009) 023608 · 7 pages, 3 figures, minor changes
arxiv created 2009/01/12 · arxiv updated 2009/12/01
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.