Matches in SemOpenAlex for { <https://semopenalex.org/work/W2484495512> ?p ?o ?g. }
- W2484495512 abstract "We present a theory of the phononic thermal (Kapitza) resistance at the interface between graphene or another single-layer two-dimensional (2D) crystal (e.g., ${mathrm{MoS}}_{2})$ and a flat substrate, based on a modified version of the cross-plane heat transfer model by Persson, Volokitin, and Ueba [J. Phys.: Condens. Matter 23, 045009 (2011)]. We show how intrinsic flexural phonon damping is necessary for obtaining a finite Kapitza resistance and also generalize the theory to encased single-layer 2D crystals with a superstrate. We illustrate our model by computing the thermal boundary conductance (TBC) for bare and ${mathrm{SiO}}_{2}$-encased single-layer graphene and ${mathrm{MoS}}_{2}$ on a ${mathrm{SiO}}_{2}$ substrate, using input parameters from first-principles calculation. The estimated room temperatures TBC for bare (encased) graphene and ${mathrm{MoS}}_{2}$ on ${mathrm{SiO}}_{2}$ are 34.6 (105) and 3.10 (5.07) ${mathrm{MW}phantom{rule{0.16em}{0ex}}mathrm{K}}^{ensuremath{-}1}{mathrm{m}}^{ensuremath{-}2}$, respectively. The theory predicts the existence of a phonon frequency crossover point, below which the low-frequency flexural phonons in the bare 2D crystal do not dissipate energy efficiently to the substrate. We explain within the framework of our theory how the encasement of graphene with a top ${mathrm{SiO}}_{2}$ layer introduces new low-frequency transmission channels, which significantly reduce the graphene-substrate Kapitza resistance. We emphasize that the distinction between bare and encased 2D crystals must be made in the analysis of cross-plane heat dissipation to the substrate." @default.
- W2484495512 created "2016-08-23" @default.
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- W2484495512 date "2016-10-21" @default.
- W2484495512 modified "2023-09-27" @default.
- W2484495512 title "Theory of substrate-directed heat dissipation for single-layer graphene and other two-dimensional crystals" @default.
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- W2484495512 doi "https://doi.org/10.1103/physrevb.94.165427" @default.
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