Effect of phonon confinement on the ...
Type de document :
Communication dans un congrès avec actes
DOI :
Titre :
Effect of phonon confinement on the dispersion relation and heat capacity in nanoscale Si membranes
Auteur(s) :
Cuffe, J. [Auteur]
Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
Chávez, E. [Auteur]
Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
Shchepetov, A. [Auteur]
Technical Research Centre of Finland
Chapuis, P.O. [Auteur]
Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
El Boudouti, E.H. [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Alzina, F. [Auteur]
Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
Pennec (Admin), Yan [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Djafari-Rouhani, Bahram [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Prunnila, M. [Auteur]
Technical Research Centre of Finland
Ahopelto, J. [Auteur]
Technical Research Centre of Finland
Sotomayor Torres, C.M. [Auteur]
Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
Chávez, E. [Auteur]
Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
Shchepetov, A. [Auteur]
Technical Research Centre of Finland
Chapuis, P.O. [Auteur]
Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
El Boudouti, E.H. [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Alzina, F. [Auteur]
Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
Pennec (Admin), Yan [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Djafari-Rouhani, Bahram [Auteur]
Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520 [IEMN]
Prunnila, M. [Auteur]
Technical Research Centre of Finland
Ahopelto, J. [Auteur]
Technical Research Centre of Finland
Sotomayor Torres, C.M. [Auteur]
Universitat Autònoma de Barcelona = Autonomous University of Barcelona = Universidad Autónoma de Barcelona [UAB]
Titre de la manifestation scientifique :
ASME 2012 International Mechanical Engineering Congress and Exposition, Symposium on Phononic Crystals and Acoustic Metamaterials
Ville :
Houston
Pays :
Etats-Unis d'Amérique
Date de début de la manifestation scientifique :
2012-11-09
Titre de l’ouvrage :
Proceedings of the ASME 2012 International Mechanical Engineering Congress and Exposition, Symposium on Phononic Crystals and Acoustic Metamaterials
ASME 2012 International Mechanical Engineering Congress and Exposition, Symposium on Phononic Crystals and Acoustic Metamaterials
ASME 2012 International Mechanical Engineering Congress and Exposition, Symposium on Phononic Crystals and Acoustic Metamaterials
Date de publication :
2012
Discipline(s) HAL :
Sciences de l'ingénieur [physics]
Résumé en anglais : [en]
The effect of confinement on the acoustic phonon dispersion relation and heat capacity in free-standing silicon membranes is investigated, with thickness values down ∼ 8 nm. The discrete phonon branches are observed by ...
Lire la suite >The effect of confinement on the acoustic phonon dispersion relation and heat capacity in free-standing silicon membranes is investigated, with thickness values down ∼ 8 nm. The discrete phonon branches are observed by angle-resolved inelastic light scattering spectroscopy. The fundamental flexural mode was observed to have a scattering intensity nearly two orders of magnitude larger than the fundamental dilatational mode, which is ascribed to its large out-of-plane density of states and quadratic dispersion. The quadratic dispersion also results in a reduction of the phase and group velocities of the fundamental flexural mode by more than one order of magnitude compared to bulk values. To investigate the effect of this behavior on the thermal conductivity, we perform calculations based on continuum elasticity theory to estimate corresponding changes in the heat capacity. This work provides a basis to investigate the effects of the frequency and dimension dependence of other phonon properties, in particular in the sub-20 nm regime, where phonon-phonon relaxation times, density of states and thermal conductivity are expected to possess different spectral dependencies than for bulk materials.Lire moins >
Lire la suite >The effect of confinement on the acoustic phonon dispersion relation and heat capacity in free-standing silicon membranes is investigated, with thickness values down ∼ 8 nm. The discrete phonon branches are observed by angle-resolved inelastic light scattering spectroscopy. The fundamental flexural mode was observed to have a scattering intensity nearly two orders of magnitude larger than the fundamental dilatational mode, which is ascribed to its large out-of-plane density of states and quadratic dispersion. The quadratic dispersion also results in a reduction of the phase and group velocities of the fundamental flexural mode by more than one order of magnitude compared to bulk values. To investigate the effect of this behavior on the thermal conductivity, we perform calculations based on continuum elasticity theory to estimate corresponding changes in the heat capacity. This work provides a basis to investigate the effects of the frequency and dimension dependence of other phonon properties, in particular in the sub-20 nm regime, where phonon-phonon relaxation times, density of states and thermal conductivity are expected to possess different spectral dependencies than for bulk materials.Lire moins >
Langue :
Anglais
Comité de lecture :
Oui
Audience :
Non spécifiée
Vulgarisation :
Non
Source :
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- Cuffe2012.pdf
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