Work

Ab Initio G W Many-Body Effects in Graphene

Year: 2008

Type: article

Abstract: We present an ab initio numerical many-body GW calculation of the band plot in freestanding graphene. We consider the full ionic and electronic structure introducing e-e interaction and correlation effects via a self-energy containing non-Hermitian and dynamical terms. With respect to the density-functional theory local-density approximation, the Fermi velocity is renormalized with an increase of 17%, in better agreement with the experiment. Close to the Dirac point the linear dispersion is modified by the presence of a kink, as observed by angle-resolved photoemission spectroscopy. We demonstrate that the kink is due to low-energy pi-->pi* single-particle excitations and to the pi plasmon. The GW self-energy does not open the band gap.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.101.226405

Authors: Paolo E. Trevisanutto, Christine Giorgetti, Lucia Reining, Massimo Ladisa, Valerio Olevano

Institutions: Centre National de la Recherche Scientifique, Université Joseph Fourier, European Theoretical Spectroscopy Facility, Institut Néel, École Polytechnique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Laboratoire des Solides Irradiés, Institute of Crystallography

Language: Latvian

Topic: Graphene research and applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

OpenAlex ID: W2082423355

FWCI: 7.24

Cites: 27

Cited by: 295

Related to: 10