多层偶极凝聚体中的集体激发和不稳定性
Collective excitations and instabilities in multi-layer stacks of dipolar condensates
摘要：
我们从理论上分析了二维偶极凝聚体多层结构中的集体模色散，发现了一个强增强的旋子不稳定性。我们讨论了运动凝聚体的动力学不稳定性和旋转软化之间的相互作用。我们使用我们的结果来分析系统中的s-波散射长度被调谐到接近零使用费什巴赫共振的布洛赫振荡的退相干率。我们的结果与Fattori { \it et al.}在$^{39}$ K原子上。
英文摘要：
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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