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Title

Quasiballistic phonon transport from first principles

AuthorsTorres, Pol; Royo Valls, Miquel; López Suárez, Miquel; Shiomi, Junichiro; Rurali, Riccardo CSIC ORCID
KeywordsThermal-conductivity
Issue Date26-Oct-2020
PublisherAmerican Physical Society
CitationPhysical Review - Section B - Condensed Matter 102(14): 144305 (2020)
AbstractAt short length scales phonon transport is ballistic: the thermal resistance of semiconductors and insulators is quantized and length independent. At long length scales, on the other hand, transport is diffusive and resistance arises as a result of the scattering processes experienced by phonons. In many cases of interest, however, these two transport regimes coexist. Here we propose a first-principles approach to treat quasiballistic phonon transport where diffusive and ballistic phonons receive separate theoretical treatments. Partitioning the overall phonon population for a given transport length is performed examining the mean free paths obtained from the solution of the Boltzmann transport equation and allowing only diffusive phonons to participate in anharmonic phonon-phonon scattering processes. We present results for Si and diamond, discussing the crossover from ballistic to diffusive transport as the length scale and/or the temperature increases and compute the relative contribution of ballistic and diffusive phonons to the thermal conductance in each transport condition.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.102.144305
URIhttp://hdl.handle.net/10261/233199
ISSN2469-9950
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