Anharmonic phonon-phonon scattering at interface by non-equilibrium Green's function formalism

Abstract

The understanding and modeling of inelastic scattering of thermal phonons at a solid/solid interface remain an open question. We present a fully quantum theoretical scheme to quantify the effect of anharmonic phonon-phonon scattering at an interface via non-equilibrium Green's function (NEGF) formalism. Based on the real-space scattering rate matrix, a decomposition of the interfacial spectral energy exchange is made into contributions from local and non-local anharmonic interactions, of which the former is shown to be predominant for high-frequency phonons whereas both are important for low-frequency phonons. The anharmonic decay of interfacial phonon modes is revealed to play a crucial role in bridging the bulk modes across the interface. The overall quantitative contribution of anharmonicity to thermal boundary conductance is found to be moderate. The present work promotes a deeper understanding of heat transport at the interface and an intuitive interpretation of anharmonic phonon NEGF formalism.

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Cited by in corpus (7)

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• Interfacial Thermal Conductance Spectrum in Nonequilibrium Molecular Dynamics Simulations Considering Anharmonicity, Non-homogeneity and Quantum Effects
• Evaluation of diffuse mismatch model for phonon scattering at disordered interfaces
• Thermal resistance from non-equilibrium phonons at Si-Ge interface
• Thermal conductivity of micro/nano-porous polymers: Prediction models and applications
• Accurate estimation of interfacial thermal conductance between silicon and diamond enabled by a machine learning interatomic potential