Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-03-06
Physics
Condensed Matter
Quantum Gases
8 papges, 7 figures
Scientific paper
We study the gap solitons and nonlinear Bloch waves of interacting bosons in one-dimensional optical lattices, taking into account the interaction from the weak to the strong limits. It is shown that composition relation between the gap solitons and nonlinear Bloch waves exists for the whole span of the interaction strength. The linear stability analysis indicates that the gap solitons are stable when their energies are near the bottom of the linear Bloch band gap. By increasing the interaction strength, the stable gap solitons can turn into unstable. It is argued that the stable gap solitons can easily be formed in a weakly interacting system with energies near the bottoms of the lower-level linear Bloch band gaps.
Guo X. M.
Jing X. L.
Liu Char-Shine
Wu Way-Chen
Xu Tie-Feng
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