Evaluation of the diffuse mismatch model for phonon scattering at disordered interfaces

被引:18
作者
Song, Qichen [1 ]
Chen, Gang [1 ]
机构
[1] MIT, Dept Mech Engn, Cambridge, MA 02139 USA
基金
美国国家科学基金会;
关键词
GREENS-FUNCTION METHOD; THERMAL-CONDUCTIVITY; TRANSPORT; SIMULATION; DYNAMICS; HEAT;
D O I
10.1103/PhysRevB.104.085310
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Diffuse phonon scattering strongly affects the phonon transport through a disordered interface. The often-used diffuse mismatch model assumes that phonons lose memory of their origin after being scattered by the interface. Using mode-resolved atomistic Green's function simulation, we demonstrate that diffuse phonon scattering by a single disordered interface cannot make a phonon lose its memory and thus the applicability of the diffusive mismatch model is limited. An analytical expression for diffuse scattering probability based on the continuum approximation is also derived and shown to work reasonably well at low frequencies.
引用
收藏
页数:15
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