Interface-facilitated energy transport in coupled Frenkel-Kontorova chains  

作　　者：Rui-Xia Su Zong-Qiang Yuan Jun Wang Zhi-Gang Zheng 

机构地区：[1]Department of Physics and the Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems (Beijing), Beijing Normal University, Beijing 100875, China [2]Science and Technology on Plasma Physics Laboratory, Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang 621900, China [3]Key Laboratory of Enhanced Heat Transfer and Energy Conservation (Ministry of Education),College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China [4]College of Information Science and Engineering, Huaqiao University, Xiamen 361021, China

出　　处：《Frontiers of physics》2016年第2期125-130,共6页物理学前沿（英文版）

摘　　要：The role of interface couplings on the energy transport of two coupled Frenkel-Kontorova （FK） chains is explored through numerical simulations. In general, it is expected that the interface cou- plings result in the suppression of heat conduction through the coupled system due to the additional interface phonon-phonon scattering. In the present paper, it is found that the thermal conductivity increases with increasing intensity of interface interactions for weak inter-chain couplings, whereas the heat conduction is suppressed by the interface interaction in the case of strong inter-chain couplings. Based on the phonon spectral energy density method, we demonstrate that the enhance- ment of energy transport results from the excited phonon modes （in addition to the intrinsic phonon modes）, while the strong interface phonon-phonon scattering results in the suppressed energy transport.The role of interface couplings on the energy transport of two coupled Frenkel-Kontorova （FK） chains is explored through numerical simulations. In general, it is expected that the interface cou- plings result in the suppression of heat conduction through the coupled system due to the additional interface phonon-phonon scattering. In the present paper, it is found that the thermal conductivity increases with increasing intensity of interface interactions for weak inter-chain couplings, whereas the heat conduction is suppressed by the interface interaction in the case of strong inter-chain couplings. Based on the phonon spectral energy density method, we demonstrate that the enhance- ment of energy transport results from the excited phonon modes （in addition to the intrinsic phonon modes）, while the strong interface phonon-phonon scattering results in the suppressed energy transport.

关 键 词：interface couplings energy transport heat conduction phonon-phonon scattering Frenkel-Kontorova （FK） chains excited phonon modes phonon spectral energy density 

分 类 号：O631.1[理学—高分子化学] TN241[理学—化学]