Nonequilibrium phonon mean free paths in anharmonic chains

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorSääskilahti, Kimmoen_US
dc.contributor.authorOksanen, Janien_US
dc.contributor.authorVolz, Sebastianen_US
dc.contributor.authorTulkki, Jukkaen_US
dc.contributor.departmentDepartment of Neuroscience and Biomedical Engineeringen
dc.date.accessioned2018-08-08T10:01:28Z
dc.date.available2018-08-08T10:01:28Z
dc.date.issued2015en_US
dc.description.abstractHarnessing the power of low-dimensional materials in thermal applications calls for a solid understanding of the anomalous thermal properties of such systems. We analyze thermal conduction in one-dimensional systems by determining the frequency-dependent phonon mean free paths (MFPs) for an anharmonic chain, delivering insight into the diverging thermal conductivity observed in computer simulations. In our approach, the MFPs are extracted from the length dependence of the spectral heat current obtained from nonequilibrium molecular dynamics simulations. At low frequencies, the results reveal a power-law dependence of the MFPs on frequency, in agreement with the diverging conductivity and the recently determined equilibrium MFPs. At higher frequencies, however, the nonequilibrium MFPs consistently exceed the equilibrium MFPs, highlighting the differences between the two quantities. Exerting pressure on the chain is shown to suppress the mean free paths and to generate a weaker divergence of MFPs at low frequencies. The results deliver important insight into the anomalous thermal conduction in low-dimensional systems and also reveal differences between the MFPs obtained from equilibrium and nonequilibrium simulations.en
dc.description.versionPeer revieweden
dc.format.extent1-7
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationSääskilahti, K, Oksanen, J, Volz, S & Tulkki, J 2015, ' Nonequilibrium phonon mean free paths in anharmonic chains ', Physical Review B, vol. 92, no. 24, 245411, pp. 1-7 . https://doi.org/10.1103/PhysRevB.92.245411en
dc.identifier.doi10.1103/PhysRevB.92.245411en_US
dc.identifier.issn1098-0121
dc.identifier.issn1550-235X
dc.identifier.otherPURE UUID: 5f01b69c-f18d-481c-acbb-9332cc1302dben_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/5f01b69c-f18d-481c-acbb-9332cc1302dben_US
dc.identifier.otherPURE LINK: http://dx.doi.org/10.1103/PhysRevB.92.245411en_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/26800537/PhysRevB.92.245411.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/33074
dc.identifier.urnURN:NBN:fi:aalto-201808084474
dc.language.isoenen
dc.relation.ispartofseriesPHYSICAL REVIEW Ben
dc.relation.ispartofseriesVolume 92, issue 24en
dc.rightsopenAccessen
dc.titleNonequilibrium phonon mean free paths in anharmonic chainsen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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