Condensed Matter Seminar: Glenn Wagner

Transport in bilayer graphene near charge neutrality: Which scattering mechanisms are important?
Motivated by recent experiments on suspended bilayer graphene, we study transport in bilayer graphene near charge neutrality. We use the semiclassical quantum Boltzmann equation (QBE) to numerically calculate the dc transport properties. We find that phonon scattering is crucial even at temperatures below 40 K. 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.