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arXiv · 0812.3543

Hybrid multi-site excitations in dipolar condensates in optical lattices

M. Klawunn·L. Santos
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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.

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M. Klawunn, L. Santos. 2008-12-18. Hybrid multi-site excitations in dipolar condensates in optical lattices. https://doi.org/10.1103/physreva.80.013611

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