To the top

Page Manager: Webmaster
Last update: 9/11/2012 3:13 PM

Tell a friend about this page
Print version

Bilayer graphene spectral… - University of Gothenburg, Sweden Till startsida
To content Read more about how we use cookies on

Bilayer graphene spectral function in the random phase approximation and self-consistent GW approximation

Journal article
Authors Andro Sabashvili
Stellan Östlund
Mats Granath
Published in Physical Review B. Condensed Matter and Materials Physics
Volume 88
Pages artikel nr 085439
ISSN 1098-0121
Publication year 2013
Published at Department of Physics (GU)
Pages artikel nr 085439
Language en
Keywords graphene, plasmon, plasmaron
Subject categories Condensed Matter Physics


We calculate the single-particle spectral function for doped bilayer graphene in the low energy limit, described by two parabolic bands with zero band gap and long range Coulomb interaction. Calculations are done using thermal Green's functions in both the random phase approximation (RPA) and the fully self-consistent GW approximation. Consistent with previous studies RPA yields a spectral function which, apart from the Landau quasiparticle peaks, shows additional coherent features interpreted as plasmarons, i.e., composite electron-plasmon excitations. In the GW approximation the plasmaron becomes incoherent and peaks are replaced by much broader features. The deviation of the quasiparticle weight and mass renormalization from their noninteracting values is small which indicates that bilayer graphene is a weakly interacting system. The electron energy loss function, Im[−εq−1(ω)] shows a sharp plasmon mode in RPA which in the GW approximation becomes less coherent and thus consistent with the weaker plasmaron features in the corresponding single-particle spectral function.

Page Manager: Webmaster|Last update: 9/11/2012

The University of Gothenburg uses cookies to provide you with the best possible user experience. By continuing on this website, you approve of our use of cookies.  What are cookies?