VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013


 Nanophysics: from fundamentals to applications

(the return)


Tuesday 6

› 11:00 - 11:30 (30min)
Existence of an Independent Phonon Bath in a Quantum Device
Herve Courtois  1, *@  , Laetitia Pascal  1@  , Aurélien Fay  1@  , Clemens Winkelmann  1@  
1 : Institut Néel  (NEEL)  -  Website
CNRS : UPR2940, Université Joseph Fourier - Grenoble I, Institut National Polytechnique de Grenoble - INPG, Institut National Polytechnique de Grenoble (INPG)
25 avenue des Martyrs - BP 166 38042 GRENOBLE CEDEX 9 -  France
* : Corresponding author

At low temperatures, the thermal wavelength of acoustic phonons in a metallic thin film on a substrate can widely exceed the film thickness. It is thus generally believed that a mesoscopic device operating at low temperature does not carry an individual phonon population. In this talk, we will provide direct experimental evidence for the thermal decoupling of phonons in a mesoscopic quantum device from its substrate phonon heat bath at a sub-Kelvin temperature. A simple heat balance model assuming an independent phonon bath following the usual electron-phonon and Kapitza coupling laws can account for all experimental observations.

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