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Gravity-induced Wannier-Stark ladder in an optical lattice

J. Zapata, A. M. Guzman, M. G. Moore, P. Meystre

cond-matarXiv:cond-mat/0009185

Abstract

We discuss the dynamics of ultracold atoms in an optical potential accelerated by gravity. The positions and widths of the Wannier-Stark ladder of resonances are obtained as metastable states. The metastable Wannier-Bloch states oscillate in a single band with the Bloch period. The width of the resonance gives the rate transition to the continuum.

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