منابع مشابه
Heat conduction and phonon localization in disordered harmonic crystals
We investigate the steady-state heat current in twoand three-dimensional isotopically disordered harmonic lattices. Using localization theory as well as kinetic theory we estimate the system size dependence of the current. These estimates are compared with numerical results obtained using an exact formula for the current given in terms of a phonon transmission function, as well as by direct non...
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We study the transmission coefficient of a plane wave through a 1D finite quasi-periodic system – the Frenkel-Kontorova (FK) model – embedding in an infinite uniform harmonic chain. By varying the mass of atoms in the infinite uniform chain, we obtain the transmission coefficients for all eigenfrequencies. The phonon localization of the incommensurated FK chain is also studied in terms of the t...
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A model for phonon heat conduction in a semiconductor nanowire with dimensions comparable to the phonon mean free path is developed. It is based on the solution of Boltzmann’s equation, which takes into account i modification of the acoustic phonon dispersion due to spatial confinement, and ii change in the nonequilibrium phonon distribution due to partially diffuse boundary scattering. Numeric...
متن کاملPhonon heat conduction in layered anisotropic crystals
The thermal properties of anisotropic crystals are of both fundamental and practical interest, but transport phenomena in anisotropic materials such as graphite remain poorly understood because solutions of the Boltzmann equation often assume isotropy. Here, we extend an analytic solution of the transient, frequencydependent Boltzmann equation to highly anisotropic solids and examine its predic...
متن کاملCoherent phonon heat conduction in superlattices.
The control of heat conduction through the manipulation of phonons as coherent waves in solids is of fundamental interest and could also be exploited in applications, but coherent heat conduction has not been experimentally confirmed. We report the experimental observation of coherent heat conduction through the use of finite-thickness superlattices with varying numbers of periods. The measured...
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ژورنال
عنوان ژورنال: Science Advances
سال: 2018
ISSN: 2375-2548
DOI: 10.1126/sciadv.aat9460