Phys.org  July 20, 2022
An international team of researchers (USA – Columbia University, Cornell University, Brown University, Singapore, Japan) combined theoretical and experimental study of ambipolar hydrodynamic transport in bilayer graphene to demonstrate that the conductivity is given by the sum of two Drude-like terms that describe relative motion between electrons and holes, and the collective motion of the electron-hole plasma. As predicted, the measured conductivity of gapless, charge-neutral bilayer graphene was sample- and temperature-independent over a wide range. Away from neutrality, the electron-hole conductivity collapsed to a single curve, and a set of just four fitting parameters provided quantitative agreement between theory and experiment at all densities, temperatures, and gaps measured. According to the researchers their work validates recent theories for dissipation-enabled hydrodynamic conductivity and creates a link between semiconductor physics and the emerging field of viscous electronics…read more. Open Access TECHNICAL ARTICLEÂ
Schematic of dissipative hydrodynamics…. Credit: SCIENCE ADVANCES, 15 Apr 2022, Vol 8, Issue 15