Abstract
The goal of reduce the device sizes and obtain faster performance has caused that recent experiments are moving the focus to measurements at short length and time scales [1–7]. This makes it necessary to have a model which is able to work in the transient regime between diffusive and ballistic heat transport. Such models would depend strongly on the phonon mean free paths (MFP) and mean free times (MFT). For that reason, models able to provide a deeper insight on the different transport phenomena would become a suitable tool for such experiments. Works along this line have demonstrated that pure kinetic models are not enough to understand thermal conductivity at short length and time scales [5, 7]. A collective or hydrodynamic flow has been used to explain the origin of the non-monotonous dependence of the thermal boundary resistance as a function of the size of the heating source arising from ultrafast laser heating experiments [7]. Also theoretically, collective transport has been successfully used to understand first principles results on graphene thermal transport [8, 9], where normal (N) scattering plays an important role. All seems to point out that models including collective effects will be necessary in next years in order to analyze these new experiments.
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Torres Alvarez, P. (2018). Phonon Spectrum and Transient Regimes in the KCM. In: Thermal Transport in Semiconductors. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-94983-3_6
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