Dielectric function, screening, and plasmons in two-dimensional graphene

The dynamical dielectric function of two-dimensional graphene at arbitrary wave vector q and frequency omega, epsilon(q,omega), is calculated in the self-consistent-field approximation. The results are used to find the dispersion of the plasmon mode and the electrostatic screening of the Coulomb interaction in two-dimensional (2D) graphene layer within the random-phase approximation. At long wavelengths (q -> 0), the plasmon dispersion shows the local classical behavior omega(cl)=omega(0)root q, but the density dependence of the plasma frequency (omega(0)proportional to n(1/4)) is different from the usual 2D electron system (omega(0)proportional to n(1/2)). The wave-vector-dependent plasmon dispersion and the static screening function show very different behavior than the usual 2D case. We show that the intrinsic interband contributions to static graphene screening can be effectively absorbed in a background dielectric constant.