Asymmetric Landau-Zener tunneling in a periodic potential

Preprint

9 June 2003

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/0306210

Abstract

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.

Keywords

RATES FOR A CONDENSATE
LANDAU ZENER TUNNELING
NUMERICAL SIMULATIONS
PERIODIC POTENTIAL
ASYMMETRIC LANDAU
ZENER TUNNELING

All Related Versions

Version 1, 2003-06-09, ArXiv
Published version: Physical Review Letters, 91 (23), 230406.

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