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Título: | Disentangling phonon channels in nanoscale heat transport |
Autor: | Mukherjee, Samik; Wajs, Marcin; Mata, Maria de la CSIC ORCID; Givan, U.; Senz, S.; Arbiol, Jordi CSIC ORCID CVN; Francoeur, Sebastien; Moutanabbir, Oussama | Palabras clave: | Lattice-thermal conductivity Nanocrystals Phonons Scattering theory Thermal conductivity Nanowires Semiconductors |
Fecha de publicación: | 16-ago-2021 | Editor: | American Physical Society | Citación: | Physical Review - Section B - Condensed Matter 104(7): 075429 | Resumen: | Phonon surface scattering has been at the core of heat transport engineering in nanoscale devices. Herein, we demonstrate that this phonon pathway can be the sole mechanism only below a critical, size-dependent temperature. Above this temperature, the lattice phonon scattering coexists along with surface effects. By tailoring the mass disorder at the atomic level, the lattice dynamics in nanowires was artificially controlled without affecting morphology, crystallinity, chemical composition, or electronic properties, thus allowing the mapping of the temperature-thermal conductivity-diameter triple parameter space. This led to the identification of the critical temperature below which the effects of lattice mass disorder are suppressed to an extent that phonon transport becomes governed entirely by the surface. This behavior is discussed based on a modified Landauer-Datta-Lundstrom near-equilibrium transport model. Besides disentangling the main phonon scattering mechanisms, the established framework also provides the necessary input to further advance the design and modeling of heat transport in semiconductor nanoscale systems. | Versión del editor: | http://doi.org/10.1103/PhysRevB.104.075429 | URI: | http://hdl.handle.net/10261/264704 | DOI: | 10.1103/PhysRevB.104.075429 | Identificadores: | doi: 10.1103/PhysRevB.104.075429 issn: 2469-9969 |
Aparece en las colecciones: | (CIN2) Artículos |
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