Interface-facilitated energy transport in coupled Frenkel–Kontorova chains

Abstract

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 couplings 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 enhancement 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.

Keywords

interface couplings / energy transport / heat conduction / phonon-phonon scattering / Frenkel–Kontorova (FK) chains / excited phonon modes / phonon spectral energy density

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg