“…[2,12,13] However, if the interactions (bare or renormalized) are retarded, we usually end up analyzing Bethe-Salpeter equations (or the related quantum transport equations) in a way consistent with the Dyson equations for electrons and phonons. [1,14] In graphene, conduction electrons are assumed to be weakly interacting, and, in principle, one can use the approximate solution of the Bethe-Salpeter equations in which the electron-hole self-energy is replaced by the memory function, or even by the frequency-independent relaxation rate. [15] In this paper, the quantum transport equations from Refs.…”