基于热质理论的纳米系统热整流现象

Nanoscale Thermal Rectification Based on Thermomass Theory

热整流现象是近年来在纳米系统中发现的一种特殊热传导现象,具有重要的应用前景,但是缺乏明确的物理解释和宏观物理图像。本文基于热质理论将导热过程与流体力学相类比,论证了热质运动的空间惯性力可以导致非对称导热介质中的热整流现象,并举例分析了硅纳米薄膜中的热整流效应。热质理论预测的热整流系数可达40%,足以满足构建热晶体管或者逻辑门的需求。

The thermal rectification is a novel and important heat conduction behavior in nanosys- tems. The present understanding of thermal rectification is unclear and controversial. In this paper, we compare the heat conduction to fluid dynamics based on the thermomass theory and prove that the spatial inertia of thermomass can cause the rectification behavior in non-symmetric systems. The predicted rectification parameter in Si nanofilms can be up to 40% which meets the demand of thermal transistor or logical gates.