arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1003.1235cond-mat.str-el
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低维晶格中玻色玻璃相的表征

Characterization of the Bose-glass phase in low-dimensional lattices

Juan Carrasquilla, Federico Becca, Andrea Trombettoni, Michele Fabrizio

摘要:

用数值模拟的方法研究了低维晶格中的无序玻色-哈伯德模型。我们表明,一个适当的表征有限无序集群的相图需要的概率分布的物理量的知识,而不是他们的平均值。这特别适用于确定玻色玻璃相的稳定区域,玻色玻璃相是可压缩的,但不是超流相,只要存在无序。这一结果表明,类似的统计分析也应该进行解释实验的冷气体被困在无序晶格,限制,因为他们是有限的大小。

英文摘要:

We study by numerical simulation a disordered Bose-Hubbard model in low-dimensional lattices. We show that a proper characterization of the phase diagram on finite disordered clusters requires the knowledge of probability distributions of physical quantities rather than their averages. This holds in particular for determining the stability region of the Bose-glass phase, the compressible but not superfluid phase that exists whenever disorder is present. This result suggests that a similar statistical analysis should be performed also to interpret experiments on cold gases trapped in disordered lattices, limited as they are to finite sizes.

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