Abstract
We study the frequency dependencies in the renormalization of the fermion Green's function for the -band electrons in graphene and their influence on the dynamical gap generation at sufficiently strong interaction. Adopting the effective QED-like description for the low-energy excitations within the Dirac-cone region, we self-consistently solve the fermion Dyson-Schwinger equation in various approximations for the photon propagator and the vertex function with special emphasis on frequency-dependent Lindhard screening and retardation effects.
- Received 25 May 2016
- Revised 15 July 2016
DOI:https://doi.org/10.1103/PhysRevB.94.125102
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