Collective excitations and instabilities in multi-layer stacks of dipolar condensates

Details Collective excitations and instabilities in multi-layer stacks of dipolar condensates Collective excitations and instabilities in multi-layer stacks of dipolar condensates

2008-12-10

arxiv.org/abs/0812.1838v1

Physics

Condensed Matter

Other Condensed Matter

5 pages with 3 figures

Scientific paper

We analyze theoretically the collective mode dispersion in multi-layer stacks of two dimensional dipolar condensates and find a strong enhancement of the roton instability. We discuss the interplay between the dynamical instability and roton softening for moving condensates. We use our results to analyze the decoherence rate of Bloch oscillations for systems in which the s-wave scattering length is tuned close to zero using Feshbach resonance. Our results are in qualitative agreement with recent experiments of Fattori {\it et al.} on $^{39}$K atoms.

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