The quasiparticle lifetime in a doped graphene sheet

Abstract

We present a calculation of the quasiparticle decay rate due to electron-electron interactions in a doped graphene sheet. In particular, we emphasize subtle differences between the perturbative calculation of this quantity in a doped graphene sheet and the corresponding one in ordinary parabolic-band two-dimensional (2D) electron liquids. In the random phase approximation, dynamical overscreening near the light cone yields a universal quasiparticle lifetime, which is independent of the dielectric environment surrounding the 2D massless Dirac fermion fluid.

8 pages; to be published by Edizioni della Normale (Pisa, Italy) in a volume in honor of Gabriele F. Giuliani edited by M. Polini, G. Vignale, V. Pellegrini, and J.K. Jain