Contribution to the study of energy transport in condensed matter: phonons, electrons and photons
Description
Energy transport at the nano-scale involves different types of carriers - phonon, electron and photon. Their spatial confinement in nano-structured materials implies the invalidation of the macroscopic laws of heat transfer. Therefore, new mechanisms arise and lead to novel thermal properties. This manuscript is devoted to the study of phonon transport in nano-materials as well as the dissipation processes involving photon-electron and electron-phonon interactions. It is divided in three independent parts. We have first investigated the wave properties of thermal phonons. We have developed a theory to quantitatively assess the coherence of these carriers. Then, we have addressed the coupling between plasmonics and phonon transport in metallic materials. The objective is to quantify how the heat generated by the absorption of an electromagnetic energy will impact the surrounding medium. In the last part, we have included the Bose-Einstein quantum statistics in Molecular Dynamics simulations in order to compute thermal properties of nano-materials at low temperatures. (author)
Abstract (French)
Nous avons etudie durant cette these les transferts de chaleur mettant en jeu differents types de porteur d'energie - phonons, electrons et photons - dans des materiaux nanostructures. A ces echelles, les lois regissant les phenomenes physiques sont differentes des lois macroscopiques. Il est donc necessaire de developper de nouveaux outils pour etudier ces nouveaux mecanismes. Dans une premiere partie, nous nous sommes interesses aux proprietes ondulatoires des phonons thermiques. Nous avons ainsi developpe une theorie pour quantifier leur coherence temporelle et spatiale. Dans une seconde partie, nous nous sommes tournes vers la thermo-plasmonique, c'est-a-dire vers le chauffage par absorption de lumiere d'un metal et la redistribution de l'energie au reseau cristallin par interactions electron-phonon. Dans une derniere partie, nous avons porte notre etude sur la possibilite d'inclure les effets quantiques dans la Dynamique Moleculaire, ouvrant ainsi l'acces aux proprietes thermiques de nano-materiaux aux basses temperatures. (auteur)
Files
Restricted
The record is publicly accessible, but files are restricted to users with access.
Additional details
Additional titles
- Original title (French)
- Contribution a l'etude du transport d'energie dans la matiere condensee: phonons, electrons et photons
Publishing Information
- Imprint Pagination
- 333 p.
- Report number
- FRNC-TH--11342
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 52006916
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- BOSE-EINSTEIN STATISTICS; ELECTRON-PHONON COUPLING; MOLECULAR DYNAMICS METHOD; NANOMATERIALS; PHONONS; POTENTIALS; THERMAL CONDUCTION; THERMAL RADIATION
- Descriptors DEC
- CALCULATION METHODS; COUPLING; ELECTROMAGNETIC RADIATION; ENERGY TRANSFER; HEAT TRANSFER; MATERIALS; QUASI PARTICLES; RADIATIONS
Optional Information
- Notes
- 258 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses