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| Pàgina inicial > Articles > Articles publicats > Hydrodynamic signatures in thermal transport in devices based on two-dimensional materials : |
(Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica) (Vienna University of Technology) (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)| Data: | 2022 |
| Descripció: | 15 pàg. |
| Resum: | We investigate the features arising from hydrodynamic effects in graphene and phosphorene devices with finite heat sources, using ab initio calculations to go beyond Callaway's model and inform a full linearized scattering operator, and solving the phonon Boltzmann transport equation through energy-based deviational Monte Carlo methods. We explain the mechanisms that create those hydrodynamic features, showing that boundary scattering and the relation of sample dimensions to the nonlocal length ℓ are the determinant factors, regardless of the relative importance of normal versus resistive scattering. From this point of view, the nonlocal length ℓ reflects the ability of scattering to randomize the heat flux, and we show that approximations made on the scattering operator may have, through the value of ℓ, qualitative consequences on the signatures of hydrodynamic behavior. |
| Ajuts: | European Commission 881603 Agencia Estatal de Investigación RTI2018-097876-B-C21 Ministerio de Educación, Cultura y Deporte FPU2016/02565 Ministerio de Ciencia, Innovación y Universidades EST19/00848 |
| Drets: | Tots els drets reservats.  |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió publicada |
| Matèria: | Phonons ; Thermal properties ; Graphene ; Phosphorene ; Boltzmann theory ; First-principles calculations ; Hydrodynamic models ; Monte Carlo methods |
| Publicat a: | Physical review B, Vol. 106, issue 1 (July 2022) , art. 14308, ISSN 2469-9969 |
