Nonlinearity enhanced interfacial thermal conductance and rectification

Abstract

We study the nonlinear interfacial thermal transport across atomic junctions by the quantum self-consistent mean field (QSCMF) theory based on nonequilibrium Green's function approach; the QSCMF theory we propose is very precise and matches well with the exact results from quantum master equations. The nonlinearity at the interface is studied by effective temperature dependent interfacial coupling calculated from the QSCMF theory. We find that nonlinearity can provide an extra channel for phonon transport in addition to the phonon scattering which usually blocks heat transfer. For weak linearly coupled interface, the nonlinearity can enhance the interfacial thermal transport; with increasing nonlinearity or temperature, the thermal conductance shows nonmonotonical behavior. The interfacial nonlinearity also induces thermal rectification, which depends on the mismatch of the two leads and also the interfacial linear coupling.

6 pages, 6 figures, accepted by EPL on Sep 11, 2013

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• Interfacial thermal transport with strong system-bath coupling: A phonon delocalization effect
• Quantum thermal transport through anharmonic systems: A self-consistent approach
• Cumulants of heat transfer across nonlinear quantum systems
• Quantum transient heat transport in the hyper-parametric oscillator
• Heat current magnification in Classical and Quantum spin networks
• Heat rectification by two qubits coupled with Dzyaloshinskii-Moriya interaction