热整流效应的消失与翻转现象  

Elimination of thermal rectification effect and the reversed thermal diode

作　　者：王军[1] 李京颍[2] 郑志刚[1] 

机构地区：[1]北京师范大学物理系,北京100875 [2]阜阳师范学院物理与电子科学学院,阜阳236041

出　　处：《物理学报》2010年第1期476-481,共6页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:70431002);国家自然科学基金(批准号:10575010);国家重点基础研究发展计划(973)项目(批准号:2007CB814805)资助的课题~~

摘　　要：研究了热整流器模型当中碰撞效应对其热传导性质,尤其是热整流效应的影响:碰撞会引起声子能带的交叠.在高温区,发现在考虑了粒子间的碰撞之后,声子能带会有明显的重叠,热整流效应会被削弱甚至消失.而在低温区,由于交换热源时,碰撞效应对声子能带交叠的贡献存在差别,因而出现了翻转的热整流效应.结果表明在设计热整流器件时,必须要考虑碰撞效应的影响.We investigate the important role of interface collisions on the thermal conduction behavior, especially on the thermal rectification effect, of the two-segment lattices. In the high-average temperature regime, it is found that the thermal diode effect may be significantly weaken and even eliminated. Meanwhile in the low-temperature regime, an interesting reversed thermal diode is realized. These behaviors are interpreted in terms of phonon bands mixing induced by interface collisions. The results proposed in this paper reveal that thermal diode effect can be qualitatively influenced if the interface collisions could not be neglected.

关 键 词：热整流效应 Frenkel—Kontorova模型 热传导 

分 类 号：O551.3[理学—热学与物质分子运动论]