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

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

2008-12-03

arxiv.org/abs/0812.0684v2

Physical Review A: Atomic, Molecular and Optical Physics 79, 2 (2009) 023608

Physics

Condensed Matter

Other Condensed Matter

7 pages, 3 figures, minor changes

Scientific paper

10.1103/PhysRevA.79.023608

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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