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arXiv 1609.01065cond-mat.quant-gascond-mat.dis-nnquant-ph
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超冷原子的安德森局域化:迁移率边缘在哪里?

Anderson localization of ultracold atoms: Where is the mobility edge?

Michael Pasek, Giuliano Orso, Dominique Delande

摘要:

最近的实验非相互作用的超冷原子在相关无序产生了相互矛盾的结果,关于所谓的迁移率边缘,即能量阈值分离安德森本地化扩散状态。与此同时,有理论表明,实验数据高估了这个临界能量的位置,有时是很大的量。各向异性在实验散斑势的空间相关性中的重要作用被认为是造成这种差异的一个可能原因。使用广泛的数值模拟,我们表明,各向异性的影响是不足以解释的实验数据。特别是,我们发现,对于不太强的各向异性,现实的无序配置基本上是相同的各向同性的情况下,模一个简单的重新调整的能量。

英文摘要:

Recent experiments on non-interacting ultra-cold atoms in correlated disorder have yielded conflicting results regarding the so-called mobility edge, i.e. the energy threshold separating Anderson localized from diffusive states. At the same time, there are theoretical indications that the experimental data overestimate the position of this critical energy, sometimes by a large amount. The non-trivial effect of anisotropy in the spatial correlations of experimental speckle potentials have been put forward as a possible cause for such discrepancy. Using extensive numerical simulations we show that the effect of anisotropy alone is not sufficient to explain the experimental data. In particular, we find that, for not-too-strong anisotropy, realistic disorder configurations are essentially identical to the isotropic case, modulo a simple rescaling of the energies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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