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Hydrodynamic model for electron-hole plasma in graphene
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View: Figures


Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

Damping rates for the two branches of spectrum: (a, top) and (b, bottom).

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

Dispersions of plasma waves at a given carrier density  cm−2 and different thicknesses of gate dielectric.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hydrodynamic model for electron-hole plasma in graphene