Phonon hydrodynamics in frequency-domain thermoreflectance experiments
Beardo Ricol, Albert (Universitat Autònoma de Barcelona. Departament de Física)
Hennessy, Matthew G. (University of Oxford. Mathematical Institute)
Sendra Molins, Lluc (Universitat Autònoma de Barcelona. Departament de Física)
Camacho Castro, Juan (Universitat Autònoma de Barcelona. Departament de Física)
Myers, T. G. (Centre de Recerca Matemàtica)
Bafaluy Bafaluy, Javier (Universitat Autònoma de Barcelona. Departament de Física)
Àlvarez Calafell, Francesc Xavier (Universitat Autònoma de Barcelona. Departament de Física)

Date:	2020
Description:	12 pàg.
Abstract:	The hydrodynamic heat transport equation with appropriate boundary conditions and ab initio calculated coefficients is validated by comparing the corresponding analytical and numerical solutions with frequency-domain thermoreflectance experimental measurements in silicon. Special attention is devoted to identifying the resistive effects appearing at the interface between the metal transducer and the silicon substrate. We find that a Fourier model using frequency-dependent effective thermal conductivity cannot simultaneously explain the experimental phase shifts and the amplitude of the temperature oscillations, whereas the hydrodynamic model using intrinsic parameters provides good agreement across a wide temperature range. In addition, phenomenology appearing at reduced length and time scales in this kind of experiment at different temperatures is shown. Specifically, we find hydrodynamic modes of thermal transport that are analogous to pressure- and shear-wave propagation in viscoelastic media.
Grants:	European Commission 707658 Agencia Estatal de Investigación RTI2018-097876-B-C22 Agencia Estatal de Investigación MTM2017-82317-P
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Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Heat transfer ; Nanostructures ; Boltzmann theory ; Finite-element method ; First-principles calculations ; Thermoreflectance
Published in:	Physical review B, Vol. 101, issue 7 (2020) , art. 75303, ISSN 2469-9969

DOI: 10.1103/PhysRevB.101.075303

12 p, 1.2 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Grup de Propietats de Transport a la Nanoescala
Articles > Research articles
Articles > Published articles