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          Institute: Fritz-Haber-Institut     Collection: Theory     Display Documents



  history
ID: 431938.0, Fritz-Haber-Institut / Theory
Two-dimensional electron gases: Theory of ultrafast dynamics of electron-phonon interactions in graphene, surfaces, and quantum wells
Authors:Richter, M.; Carmele, A.; Butscher, S.; Bücking, Norbert; Milde, F.; Kratzer, Peter; Scheffler, Matthias; Knorr, Andreas
Language:English
Date of Publication (YYYY-MM-DD):2009-06-18
Title of Journal:Journal of Applied Physics
Journal Abbrev.:J. Appl. Phys.
Volume:105
Issue / Number:12
Start Page:122409-1
End Page:122409-7
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Many-particle electron-phonon interaction effects in two-dimensional electron gases are investigated within a Born–Markov approach. We calculate the electron-phonon interaction on a microscopic level to describe relaxation processes of quantum confined electrons on ultrafast time scales. Typical examples, where two-dimensional electron gases play a role, are surfaces and two-dimensional nanostructures such as graphene and quantum wells. In graphene, we find nonequilibrium phonon generation and ultrafast cooling processes after optical excitation. Electron relaxation dynamics at the silicon (001) 2 x 1 surface exhibits two time scales, corresponding to intrasurface and inside bulk-scattering processes. For GaAs quantum wells, we present broad emission spectra in the terahertz range assisted by LO-phonons of the barrier material.
External Publication Status:published
Document Type:Article
Communicated by:Matthias Scheffler
Affiliations:Fritz-Haber-Institut/Theory
External Affiliations:Institut für Theoretische Physik, Nichtlineare Optik und Quantenelektronik, Technische Universität Berlin,
Hardenbergstr. 36, 10623 Berlin, Germany

Theoretische Physik, Universität Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany
Identifiers:URL:http://www.fhi-berlin.mpg.de/th/th.html [For a reprint, please contact THsecretary@fhi-berlin.mpg.de]
URL:http://dx.doi.org/10.1063/1.3117236 [only subscriber]
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