Role of anharmonic phonon scattering in the in the spectrally decomposed thermal conductance at planar interfaces

Kimmo Sääskilahti, Jani Oksanen, Jukka Tulkki, Sebastian Volz

    Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

    97 Sitaatiot (Scopus)
    196 Lataukset (Pure)

    Abstrakti

    A detailed understanding of the vibrational heat transfer mechanisms between solids is essential for the efficient thermal engineering and control of nanomaterials. We investigate the frequency dependence of anharmonic scattering and interfacial thermal conduction between two acoustically mismatched solids in planar contact by calculating the spectral decomposition of the heat current flowing through an interface between two materials. The calculations are based on analyzing the correlations of atomic vibrations using the data extracted from nonequilibrium molecular dynamics simulations. Inelastic effects arising from anharmonic interactions are shown to significantly facilitate heat transfer between two mass-mismatched face-centered-cubic lattices even at frequencies exceeding the cutoff frequency of the heavier material due to (i) enhanced dissipation of evanescent vibrational modes and (ii) frequency-doubling and frequency-halving three-phonon energy transfer processes at the interface. The results provide substantial insight into interfacial energy transfer mechanisms, especially at high temperatures, where inelastic effects become important and other computational methods are ineffective.
    AlkuperäiskieliEnglanti
    Artikkeli134312
    Sivut1-8
    JulkaisuPhysical Review B
    Vuosikerta90
    Numero13
    DOI - pysyväislinkit
    TilaJulkaistu - 2014
    OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

    Tutkimusalat

    • heat transfer
    • molecular dynamics

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