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- W3098984907 abstract "The effect of the Coulomb scattering on graphene conductivity in field-effect transistor structures is discussed. Interparticle scattering (electron-electron, hole-hole, and electron-hole) and scattering on charged defects are taken into account in a wide range of gate voltages. It is shown that an intrinsic conductivity of graphene (purely ambipolar system, where both electron and hole densities exactly coincide) is defined by a strong electron-hole scattering. It has a universal value independent of the temperature. We give an explicit derivation based on the scaling theory. When there is even a small discrepancy in the electron and hole densities caused by the applied gate voltage, the conductivity is determined by both a strong electron-hole scattering and a weak external scattering: on the defects or phonons. We suggest that the density of the charged defects (occupancy of defects) depends on the Fermi energy to explain the sublinear dependence of conductivity on a fairly high gate voltage observed in the experiments. We also eliminate the contradictions between the experimental data obtained in the deposited and suspended graphene structures regarding the graphene conductivity." @default.
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- W3098984907 date "2008-11-01" @default.
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- W3098984907 title "Effect of the Coulomb scattering on graphene conductivity" @default.
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- W3098984907 doi "https://doi.org/10.1134/s0021364008170074" @default.
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