Heat conduction in the disordered Fermi-Pasta-Ulam chain

Dhar, Abhishek ; Saito, Keiji (2008) Heat conduction in the disordered Fermi-Pasta-Ulam chain Physical Review E - Statistical, Nonlinear and Soft Matter Physics, 78 (6). 061136_1-061136_4. ISSN 1539-3755

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Official URL: http://pre.aps.org/abstract/PRE/v78/i6/e061136

Related URL: http://dx.doi.org/10.1103/PhysRevE.78.061136


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~1/N2/3. We also present interesting results on the binary-mass ordered FPU chain.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:79681
Deposited On:28 Jan 2012 12:11
Last Modified:18 May 2016 21:57

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