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Transport in bilayer graphene near charge neutrality: Which scattering mechanisms are important?
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Using the semiclassical quantum Boltzmann equation (QBE), we numerically calculate the DC transport properties of bilayer graphene near charge neutrality. We find, in contrast to prior discussions, that phonon scattering is crucial even at temperatures below 40K. Nonetheless, electron-electron scattering still dominates over phonon collisions allowing a hydrodynamic approach. We introduce a simple two-fluid hydrodynamic model of electrons and holes interacting via Coulomb drag and compare our results to the full QBE calculation. We show that the two-fluid model produces quantitatively accurate results for conductivity, thermopower, and thermal conductivity.
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Dissipation-enabled hydrodynamic conductivity in a tunable bandgap semiconductor
In bilayer graphene, electron-hole collisions give a universal, temperature-independent conductivity at charge neutrality, and a tunable gap collapses the conductivity onto a single curve.
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