Enhancement effect of asymmetry on the thermal conductivity of double-stranded chain systems  

作　　者：张茂平 钟伟荣 艾保全 

机构地区：[1]Department of Physics, College of Science and Engineering, Jinan University [2]School of Physics and Telecommunication Engineering, South China Normal University

出　　处：《Chinese Physics B》2011年第10期171-176,共6页中国物理B（英文版）

基　　金：supported in part by the National Natural Science Foundation of China (Grant No. 11004082);the Natural Science Foundation of Guangdong Province of China (Grant No. 01005249);the Fundamental Research Funds for the Central Universities of China (Grant No. 21609305)

摘　　要：Using nonequilibrium molecular dynamics simulations, we study the thermal conductivity of asymmetric double chains. We couple two different single chains through interchain coupling to build three kinds of asymmetric double- stranded chain system： intrachain interaction, external potential, and mass asymmetric double chains. It is reported that asymmetry is helpful in improving the thermal conductivity of the system. We first propose double-heat flux channels to explain the influence of asymmetric structures on the thermal conductivity. The phonon spectral behaviour and finite size effect are also included.Using nonequilibrium molecular dynamics simulations, we study the thermal conductivity of asymmetric double chains. We couple two different single chains through interchain coupling to build three kinds of asymmetric double- stranded chain system： intrachain interaction, external potential, and mass asymmetric double chains. It is reported that asymmetry is helpful in improving the thermal conductivity of the system. We first propose double-heat flux channels to explain the influence of asymmetric structures on the thermal conductivity. The phonon spectral behaviour and finite size effect are also included.

关 键 词：thermal conductivity double-stranded chain asymmetric structures inter-chain flux 

分 类 号：O414.1[理学—理论物理]