Evidence of reduced surface electron-phonon scattering in the conduction band of Bi2Se3 by nonequilibrium ARPES
Crepaldi, A.; Cilento, F.; Ressel, B.; Cacho, C.; Johannsen, J. C.; Zacchigna, M.; Berger, H.; Bugnon, Ph.; Grazioli, C.; Turcu, I. C. E.; Springate, E.; Kern, K.; Grioni, M.; Parmigiani, F.
2013

Abstract

The nature of the Dirac quasiparticles in topological insulators calls for a direct investigation of the electron-phonon scattering at the surface. By comparing time-resolved ARPES measurements of the topological insulator Bi2Se3 with different probing depths, we show that the relaxation dynamics of the electronic temperature of the conduction band is much slower at the surface than in the bulk. This observation suggests that surface phonons are less effective in cooling the electron gas in the conduction band.

Details

Title Evidence of reduced surface electron-phonon scattering in the conduction band of Bi2Se3 by nonequilibrium ARPES
Author(s) Crepaldi, A. ; Cilento, F. ; Ressel, B. ; Cacho, C. ; Johannsen, J. C. ; Zacchigna, M. ; Berger, H. ; Bugnon, Ph. ; Grazioli, C. ; Turcu, I. C. E. ; Springate, E. ; Kern, K. ; Grioni, M. ; Parmigiani, F.
Published in Physical Review B
Pagination 5
Volume 88
Issue 12
Pages 121404(R)
Date 2013
Publisher College Pk, Amer Physical Soc
ISSN 1098-0121
DOI https://doi.org/10.1103/PhysRevB.88.121404
Other identifier(s) View record in Web of Science
Laboratories LSEN
LSE
Record Appears in Scientific production and competences > SB - School of Basic Sciences > IPHYS - Institute of Physics > LSEN - Laboratory of Nanoscale Science
Scientific production and competences > SB - School of Basic Sciences > SB Archives > LSE - Laboratory of Photoelectron Spectroscopy
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date 2013-11-04

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