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arXiv 1202.2653cond-mat.stat-mechquant-ph
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光晶格中的反常空间扩散与多重分形

Anomalous spatial diffusion and multifractality in optical lattices

A. Dechant, E. Lutz

摘要:

冷原子在浅光晶格中的输运具有慢的、非稳态的动量弛豫特性。在这里,我们开发了一个投影算子的方法,能够在这种情况下推导出一个广义Smoluchowski方程的位置变量。我们表明,这个明确的非马尔可夫方程可以写为一个系统的扩展,涉及高阶导数。我们使用后者来计算空间分布的任意矩,并分析其多重分形性质。

英文摘要:

Transport of cold atoms in shallow optical lattices is characterized by slow, nonstationary momentum relaxation. We here develop a projector operator method able to derive in this case a generalized Smoluchowski equation for the position variable. We show that this explicitly non-Markovian equation can be written as a systematic expansion involving higher-order derivatives. We use the latter to compute arbitrary moments of the spatial distribution and analyze their multifractal properties.

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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