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arXiv 1801.09707cond-mat.dis-nncond-mat.stat-mech
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一维热导率:无序诱导的从反常标度到正常标度的转变

Thermal conductivity in 1d: disorder-induced transition from anomalous to normal scaling

Ariel Amir, Yuval Oreg, Yoseph Imry

摘要:

众所周知,谐波声子对一维系统的热导率的贡献随着谐波链长度$L$而发散(明确地,随着$L$以具有正幂的幂律增加)。此外,在各种一维模型包含的障碍,它被证明,这种分歧仍然存在,与导热系数缩放为$\sqrt{L}$在某些边界条件下,其中$L$是谐波链的长度。在这里,我们表明,当链是弱耦合到热库,有很强的无序这种标度可以违反。我们发现一个较弱的幂律依赖于$L$,并表明,足够强的无序的热导率停止异常-尽管状态密度和分散的本地化长度缩放令人不安。令人惊讶的是,在这种强烈的无序状态下,两个相互抵消的缩放量恢复傅立叶热传输定律。

英文摘要:

It is well known that the contribution of harmonic phonons to the thermal conductivity of 1D systems diverges with the harmonic chain length $L$ (explicitly, increases with $L$ as a power-law with a positive power). Furthermore, within various one-dimensional models containing disorder it was shown that this divergence persists, with the thermal conductivity scaling as $\sqrt{L}$ under certain boundary conditions, where $L$ is the length of the harmonic chain. Here we show that when the chain is weakly coupled to the heat reservoirs and there is strong disorder this scaling can be violated. We find a weaker power-law dependence on $L$, and show that for sufficiently strong disorder the thermal conductivity stops being anomalous -- despite both density-of-states and the diverging localization length scaling anomalously. Surprisingly, in this strong disorder regime two anomalously scaling quantities cancel each other to recover Fourier's law of heat transport.

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