Condensed Matter Seminar: Glenn Wagner

Event time: 
Friday, February 14, 2020 - 1:00pm to 2:00pm
Sloane Physics Laboratory (SPL), Room 52 See map
217 Prospect Street
New Haven, CT 06511
Event description: 

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.

Open to: 
General Public