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Enhancement effect of asymmetry on the thermal conductivity of double-stranded chain systems |
Zhang Mao-Ping(张茂平)a), Zhong Wei-Rong(钟伟荣) a)†, and Ai Bao-Quan(艾保全)b) |
a Department of Physics, College of Science and Engineering, Jinan University, Guangzhou 510632, China; b School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, China |
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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.
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Received: 29 January 2011
Revised: 06 May 2011
Accepted manuscript online:
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PACS:
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05.60.-k
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(Transport processes)
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44.10.+i
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(Heat conduction)
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66.10.cd
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(Thermal diffusion and diffusive energy transport)
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44.05.+e
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(Analytical and numerical techniques)
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Fund: Project 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), and the Fundamental Research Funds for the Central Universities of China (Grant No. 21609305). |
Cite this article:
Zhang Mao-Ping(张茂平), Zhong Wei-Rong(钟伟荣), and Ai Bao-Quan(艾保全) Enhancement effect of asymmetry on the thermal conductivity of double-stranded chain systems 2011 Chin. Phys. B 20 100508
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