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In the present work this situation is studied analytically and numerically. In particular, we show that this is a way of managing the dynamics of matter waves - making them accelerating, oscillating, etc. In a general case, to describe the effect of the modulation, we compute dependence of the gap structure, of the group velocity of the Bloch wave, and of the effective mass of the soliton on spatial...
In this paper, we develop a theory of the LZ tunneling between the lowest bands of a periodic potential. Our approach reveals the role of modulational instability (MI) on the atom transfer between zones as well as the effect of (partial) suppression of the MI by the lattice acceleration. Our consideration is based on the Gross-Pitaevskii equation, which in the two-zone approximation is reduced to...
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