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arXiv 1702.05644quant-phcond-mat.stat-mech
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一维紧束缚模型中的噪声、离域和量子扩散

Noise, delocalization, and quantum diffusion in one-dimensional tight-binding models

Ehsan Gholami, Zahra Mohammaddoust Lashkami

摘要:

超弹道输运作为一种异常扩散行为,近年来在实验上得到了广泛的研究,但对它的认识还不够深入。本文研究了一维紧束缚模型中白噪声(Markov近似)对量子扩散的影响,该模型具有大小为L的周期、无序和准周期区域,它们分别附着在两个理想晶格的两端,其中波包初始位于子晶格的中心.我们发现,在某些完全局域化的系统中,诱导噪声可以使系统离域到理想的扩散相。这种可控系统可以用来研究无序和白噪声的相互作用,以及探索奇异的量子相位。

英文摘要:

As an unusual type of anomalous diffusion behavior, the (transient) superballistic transport has been experimentally observed recently but it is not well understood yet. In this paper, we investigate the white noise effect (in Markov approximation) on the quantum diffusion in 1D tight-binding model with periodic, disordered and quasi-periodic region of size L attached to two perfect lattices at both ends in which the wave packet is initially located at the center of the sublattice. We find that in some completely localized system inducing noise could delocalize the system to desirable diffusion phase. This controllable system may be used to investigate the interplay of disorder and white noise, as well as exploring exotic quantum phase.

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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