A discrete nonlinear lattice model without linear hopping is derived for BECs in quasi-periodic potentials, yielding stable breather solutions (dimers) for negative scattering lengths.
Panels with indices 1, 2 and 3 show the long-time ( T = 500 ) evo- lution of the density ρ(x, t ), currents at the initial and final stages of evolution, respectively
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Dimers and discrete breathers in Bose-Einstein condensates in a quasi-periodic potential
A discrete nonlinear lattice model without linear hopping is derived for BECs in quasi-periodic potentials, yielding stable breather solutions (dimers) for negative scattering lengths.