Direct observation of electron thermalization and electron-phonon coupling in photoexcited bismuth

Abstract : We investigate the ultrafast response of the bismuth (111) surface by means of time resolved photoemission spectroscopy. The direct visualization of the electronic structure allows us to gain insights on electron-electron and electron-phonon interaction. Concerning electron-electron interaction , it is found that electron thermalization is fluence dependent and can take as much as several hundreds of femtoseconds at low fluences. This behavior is in qualitative agreement with Landau's theory of Fermi liquids but the data show deviations from the behavior of a common 3D degenerate electron gas. Concerning electron-phonon interaction, our data allows us to directly observe the coupling of individual Bloch state to the coherent A1g mode. It is found that surface states are much less coupled to this mode when compared to bulk states. This is confirmed by ab initio calculations of surface and bulk bismuth.
Type de document :
Article dans une revue
Physical Review B : Condensed matter and materials physics, American Physical Society, 2013, 88 (7), pp.075120. 〈10.1103/PhysRevB.88.075120〉
Liste complète des métadonnées

Littérature citée [30 références]  Voir  Masquer  Télécharger

https://hal-ensta.archives-ouvertes.fr/hal-01159038
Contributeur : Jérôme Faure <>
Soumis le : mardi 2 juin 2015 - 14:39:26
Dernière modification le : mercredi 16 mai 2018 - 11:23:25
Document(s) archivé(s) le : lundi 24 avril 2017 - 23:25:23

Fichier

PRB_SurfaceStatesv3.pdf
Fichiers produits par l'(les) auteur(s)

Identifiants

Citation

Jérôme Faure, J Mauchain, E Papalazarou, M Marsi, Davide Boschetto, et al.. Direct observation of electron thermalization and electron-phonon coupling in photoexcited bismuth. Physical Review B : Condensed matter and materials physics, American Physical Society, 2013, 88 (7), pp.075120. 〈10.1103/PhysRevB.88.075120〉. 〈hal-01159038〉

Partager

Métriques

Consultations de la notice

770

Téléchargements de fichiers

490