Please use this identifier to cite or link to this item: https://doi.org/10.1088/1367-2630/ab34a0
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dc.titleValidity of local thermal equilibrium in anomalous heat diffusion
dc.contributor.authorWang, L.
dc.contributor.authorLiu, S.
dc.contributor.authorLi, B.
dc.date.accessioned2021-11-16T03:58:12Z
dc.date.available2021-11-16T03:58:12Z
dc.date.issued2019
dc.identifier.citationWang, L., Liu, S., Li, B. (2019). Validity of local thermal equilibrium in anomalous heat diffusion. New Journal of Physics 21 (8) : 83019. ScholarBank@NUS Repository. https://doi.org/10.1088/1367-2630/ab34a0
dc.identifier.issn1367-2630
dc.identifier.urihttps://scholarbank.nus.edu.sg/handle/10635/206300
dc.description.abstractLocal thermal equilibrium (LTE) is a general presumption of many theoretical analyses in nonequilibrium statistical physics. It describes a situation that although the system is not in global thermal equilibrium, each small portion of the system may still be described approximately by the laws of thermal equilibrium. The validity of LTE has however seldom been investigated carefully. Here, by studying the ensemble velocity distribution and its spatial correlation, we present strong evidences for the lack of LTE in anomalous heat diffusion processes in one dimensional harmonic lattices and the Fermi-Pasta-Ulam-? lattices. In particular, clear nonzero excess kurtosis and long range correlations have been observed, with values scaling linearly with the initial temperature difference. Therefore near thermal equilibrium is not sufficient to achieve LTE. Some existing studies that are based on the existence of LTE should be revisited. Using the same methods, we also show that LTE is still valid in the ? 4 lattice, in which heat diffuses following Fourier's law. © 2019 The Author(s). Published by IOP Publishing Ltd on behalf of the Institute of Physics and Deutsche Physikalische Gesellschaft.
dc.publisherInstitute of Physics Publishing
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.sourceScopus OA2019
dc.subjectDefinition of temperature
dc.subjectHeat diffusion
dc.subjectLocal thermal equilibrium
dc.subjectSecond law of thermodynamics
dc.typeArticle
dc.contributor.departmentDEPT OF PHYSICS
dc.description.doi10.1088/1367-2630/ab34a0
dc.description.sourcetitleNew Journal of Physics
dc.description.volume21
dc.description.issue8
dc.description.page83019
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