Nonlinear effects in periodic potentials
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M. Jona-Lasinio; O. Morsch; M. Cristiani; N. Malossi; J. H. MΓΌller; E. Courtade;
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Article
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2004
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John Wiley and Sons
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English
β 394 KB
From a two-level model for nonlinear Landau-Zener tunnelling between two energy bands of a Bose-Einstein condensate in a periodic potential we obtain unequal tunnelling rates for the two directions of tunnelling. With increasing nonlinearity, tunnelling from the ground state to the excited state is