Hybrid multi-site excitations in dipolar condensates in optical lattices
arXiv:0812.3543 · doi:10.1103/PhysRevA.80.013611
Abstract
Strong 1D lattices usually lead to unconnected two-dimensional gases. The long-range character of the dipole-dipole interactions leads to a novel scenario where non-overlapping gases at different sites may interact significantly. We show that the excitations of non-overlapping condensates in 1D optical lattices acquire a band-like character, being collectively shared by different sites. In particular, the hybridization of the modes significantly enhances the rotonization of the excitations, and may induce roton-instability. We discuss the observability of this effect in on-going experiments.
4 pages, 6 figures
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