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arXiv 1503.06502cond-mat.dis-nncond-mat.stat-mech
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关联无序谐振链中正常热传导的恢复

Recovery of normal heat conduction in harmonic chains with correlated disorder

I. F. Herrera-González, F. M. Izrailev, L. Tessieri

摘要:

我们考虑一维谐振链中的热输运同位素无序,我们的注意力主要集中在如何无序相关影响热传导。我们的方法表明,长程相关可以改变低频扩展态的数量。因此,通过适当选择相关性,可以控制电导率$κ$如何与链长$N$成比例。我们提出了一个详细的分析的作用,具体的长程相关性的大小无关的电导率是完全恢复的情况下,固定的边界条件。至于自由边界条件,我们表明,无序相关性可以导致电导率缩放为$κ\sim N^{\varepsilon}$,与标度指数$\varepsilon$是任意小(虽然不是严格为零),使正常的传导几乎恢复,即使在这种情况下。

英文摘要:

We consider heat transport in one-dimensional harmonic chains with isotopic disorder, focussing our attention mainly on how disorder correlations affect heat conduction. Our approach reveals that long-range correlations can change the number of low-frequency extended states. As a result, with a proper choice of correlations one can control how the conductivity $κ$ scales with the chain length $N$. We present a detailed analysis of the role of specific long-range correlations for which a size-independent conductivity is exactly recovered in the case of fixed boundary conditions. As for free boundary conditions, we show that disorder correlations can lead to a conductivity scaling as $κ\sim N^{\varepsilon}$, with the scaling exponent $\varepsilon$ being arbitrarily small (although not strictly zero), so that normal conduction is almost recovered even in this case.

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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