Eur. Phys. J. B 74, 479-485 (2010)
https://doi.org/10.1140/epjb/e2010-00125-3

Effect of gap opening on the quasiparticle properties of doped graphene sheets

¹ School of Physics, Institute for Research in Fundamental Sciences, (IPM) Tehran 19395-5531, Iran
² Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45195-1159, Iran

Corresponding author: asgari@theory.ipm.ac.ir

Received: 5 November 2009
Revised: 3 March 2010
Published online: 13 April 2010

Abstract

We present numerical calculations of the effect of gap opening on the quasiparticle properties of a doped graphene sheet within G₀W-RPA approximation. We present results of the renormalized Fermi velocity suppression and the renormalization constant over a broad range of the energy gap values. We find that the renormalized velocity is density independent at large density values which is in agreement with recent experimental observations. We also show that the inelastic quasiparticle lifetime decreases by increasing the gap value. Finally, we show that the inelastic mean free path reduces by increasing the gap values but in the range of the typical gap values it is large enough and transport remains in the semi-ballistic regime.