Conductivity of graphene vs. gate voltage at K, nm, and . Insets: left panel—resistivity near the Dirac point vs. gate voltage, right panel—mobility vs. chemical potential.
Dispersion of plasma and electron-hole sound waves at different gate voltages. Inset: non-linear dispersion of the waves at small frequencies resulting from collisions.
Velocities of plasma waves vs. gate voltage calculated for different gate layer thicknesses [Eq. (36)]. Dash-dotted line corresponds to the electron-hole sound velocity in the vicinity of the neutrality point. Regions of strong damping are filled.
Damping rates for the two branches of spectrum: (a, top) and (b, bottom).
Comparison of dispersions for plasma waves, calculated using kinetic model21 (disregarding collisions with impurities and phonons, solid line) and hydrodynamic model for V, nm, , and three different collision frequencies.
Dispersions of plasma waves at a given carrier density cm−2 and different thicknesses of gate dielectric.
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