Reduction of thermal conductance by coherent phonon scattering in two-dimensional phononic crystals of different lattice types

被引：38

作者：

Anufriev, Roman ^{[1
]}

Nomura, Masahiro ^{[1
,2
,3
]}

机构：

[1] Univ Tokyo, Inst Ind Sci, Tokyo 1538505, Japan

[2] Univ Tokyo, Inst Nano Quantum Informat Elect, Tokyo 1538505, Japan

[3] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan

来源：

PHYSICAL REVIEW B | 2016年 / 93卷 / 04期

关键词：

SILICON;

D O I：

10.1103/PhysRevB.93.045410

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The impact of lattice type, period, porosity, and thickness of two-dimensional silicon phononic crystals on the reduction of thermal conductance by coherent modification of phonon dispersion is investigated using the theory of elasticity and the finite element method. Increases in the period and porosity of the phononic crystal affect the group velocity and phonon density of states and, as a consequence, reduce the in-plane thermal conductance of the structure as compared to the unpatterned membrane. This reduction does not depend significantly on the lattice type and thickness of phononic crystals. Moreover, the reduction is strongly temperature dependent and strengthens as the temperature is increased.

引用

页数：6