Generalized two-temperature model for coupled phonons

Abstract

The design of graphene-based composite with high thermal conductivity requires a comprehensive understanding of phonon coupling in graphene. We extended the two-temperature model to coupled groups of phonon. The study give new physical quantities, the phonon-phonon coupling factor and length, to characterize the couplings quantitatively. Besides, our proposed coupling length has an obvious dependence on system size. Our studies can not only observe the nonequilibrium between different groups of phonon, but explain theoretically the thermal resistance inside graphene.

arXiv comment4figures

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• Cross interface model for the thermal transport across interface between overlapped boron nitride nanoribbons
• Inter-layer and Intra-layer Heat Transfer in Bilayer/Monolayer Graphene van der Waals Heterostructure: Is There a Kapitza Resistance Analogous?
• Reduction of interfacial thermal resistance of overlapped graphene by bonding carbon chains
• Phonon anharmonicity and thermal conductivity of two-dimensional van der Waals materials: A review
• Prediction of Hot Zone-center Optical Phonons in Laser Irradiated Molybdenum Disulfide with a Semiconductor Multitemperature Model
• Electric field effect in heat transfer in 2D devices
• Heat-to-Mechanical Energy Conversion in Graphene: Manifestation of Umklapp Enhancement with Strain