Asymmetric Landau-Zener tunneling in a periodic potential

Details Asymmetric Landau-Zener tunneling in a periodic potential Asymmetric Landau-Zener tunneling in a periodic potential

2003-06-09

arxiv.org/abs/cond-mat/0306210v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.91.230406

Using a simple model for nonlinear Landau-Zener tunneling between two energy bands of a Bose-Einstein condensate in a periodic potential, we find that the tunneling rates for the two directions of tunneling are not the same. Tunneling from the ground state to the excited state is enhanced by the nonlinearity, whereas in the opposite direction it is suppressed. These findings are confirmed by numerical simulations of the condensate dynamics. Measuring the tunneling rates for a condensate of rubidium atoms in an optical lattice, we have found experimental evidence for this asymmetry.

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