标题： 非平衡输运和基于多温度动力学模型的声子分支分辨尺寸效应 显示英文标题

标题： Non-equilibrium transport and phonon branch-resolved size effects based on a multi-temperature kinetic model

摘要： 非平衡输运和单层石墨烯材料中声子分支解析的尺寸效应在多温度动力学模型下被研究，该模型用于捕捉分支依赖的电子-声子耦合。 与典型的宏观多温度模型相比，该模型摒弃了扩散声子输运的假设，并用粒子的自由迁移和散射代替。 预测了纳米尺寸石墨烯中的声子分支和尺寸依赖的有效热导率以及边界附近的温度滑移。 与其他声子分支相比，ZA分支无论系统尺寸如何，对热传导的贡献最大。 此外，在中心有热点的纳米尺寸均匀石墨烯中，即使系统尺寸固定，分支依赖的热导率也从内部到外部增加。 当系统尺寸为数百纳米时，ZA分支的热导率甚至高于晶格热导率。 显示英文摘要

摘要： Non-equilibrium transport and phonon branch-resolved size effects in single-layer graphene materials are studied under a multi-temperature kinetic model, which is developed for capturing the branch-dependent electron-phonon coupling. Compared with typical macroscopic multi-temperature models, the assumption of diffusive phonon transport is abandoned in this model and replaced by the free migration and scattering of particles. The phonon branch- and size-dependent effective thermal conductivity is predicted in nanosized graphene as well as the temperature slips near the boundaries. Compared with other phonon branches, the ZA branch contributes the most to thermal conduction regardless of system sizes. Furthermore, in nanosized homogeneous graphene with a hotspot at the center, the branch-dependent thermal conductivity increases from the inside to the outside even if the system size is fixed. The thermal conductivity of ZA branch is even higher than the lattice thermal conductivity when the system size is hundreds of nanometers.