Article abstract
Nature Physics 3, 36 - 40 (2007)
doi:10.1038/nphys477
Subject Category: Condensed-matter physics
Quasiparticle dynamics in graphene
Aaron Bostwick1, Taisuke Ohta1,2, Thomas Seyller3, Karsten Horn2 and Eli Rotenberg1
Abstract
The effectively massless, relativistic behaviour of graphene's charge carriers—known as Dirac fermions—is a result of its unique electronic structure, characterized by conical valence and conduction bands that meet at a single point in momentum space (at the Dirac crossing energy). The study of many-body interactions amongst the charge carriers in graphene and related systems such as carbon nanotubes, fullerenes and graphite is of interest owing to their contribution to superconductivity and other exotic ground states in these systems. Here we show, using angle-resolved photoemission spectroscopy, that electron–plasmon coupling plays an unusually strong role in renormalizing the bands around the Dirac crossing energy—analogous to mass renormalization by electron–boson coupling in ordinary metals. Our results show that electron–electron, electron–plasmon and electron–phonon coupling must be considered on an equal footing in attempts to understand the dynamics of quasiparticles in graphene and related systems.
- Advanced Light Source, E. O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
- Department of Molecular Physics, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
-
Institut für Physik der Kondensierten Materie, Lehrstuhl für Technische Physik, Universität Erlangen-Nürnberg, Erwin-Rommel-Stra
e 1, D-91058 Erlangen, Germany
Correspondence to: Eli Rotenberg1 e-mail: erotenberg@lbl.gov
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