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Enhancement effect of asymmetry on the thermal conductivity of double-stranded chain systems
Authors:Zhang Mao-Ping  Zhong Wei-Rong and Ai Bao-Quan
Affiliation:Department of Physics, College of Science and Engineering, Jinan University, Guangzhou 510632, China; School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China
Abstract: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.
Keywords:thermal conductivity  double-stranded chain  asymmetric structures  inter-chain flux
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