Heat conduction in the disordered Fermi-Pasta-Ulam chain.
Heat conduction in the disordered Fermi-Pasta-Ulam chain.
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DOI：
10.1103/physreve.78.061136
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发表时间：
2008-06
期刊：
影响因子：
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通讯作者：
A. Dhar;Keiji Saito
中科院分区：
文献类型：
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作者：
A. Dhar;Keiji Saito
我们讨论了无序对非调和链中热传导的影响，并给出了由费米-帕斯塔-乌拉姆（FPU）势给出的相互作用。与之前一篇论文的结论相反。Rev. Lett. 86, 63(2001)]，发现无序可以在低温下诱导有限热导率，我们没有发现在导电性能中有有限温度转变的证据。相反，我们发现在低温下，小系统尺寸输运性质是由无序主导的，但系统尺寸对电流的渐近依赖由通常的FPU结果J给出。{23}。我们在二质量有序FPU链上也得到了有趣的结果。
We address the question of the effect of disorder on heat conduction in an anharmonic chain with interactions given by the Fermi-Pasta-Ulam (FPU) potential. In contrast to the conclusions of an earlier paper [Phys. Rev. Lett. 86, 63 (2001)], which found that disorder could induce a finite thermal conductivity at low temperatures, we find no evidence of a finite-temperature transition in conducting properties. Instead, we find that at low temperatures, small system-size transport properties are dominated by disorder but the asymptotic system size dependence of current is given by the usual FPU result J approximately 1N;{23} . We also present interesting results on the binary-mass ordered FPU chain.