Coulomb drag of viscous electron fluids: drag viscosity and negative drag conductivity

Abstract

We show that Coulomb drag in hydrodynamic bilayer systems leads to additional viscosity terms in the hydrodynamic equations, i.e., the drag and drag-Hall viscosities, besides the well-known kinematic and Hall viscosities. These new viscosity terms arise from a change of the stress tensor due to the interlayer Coulomb interactions. All four viscosity terms are tunable by varying the applied magnetic field and the electron densities in the two layers. At certain ratios between the electron densities in the two layers, the drag viscosity dramatically changes the longitudinal transport resulting in a negative drag conductivity.

4 pages + Appendix, 4 figures

References in corpus (4)

• Hydrodynamics of electrons in graphene
• Non-local transport and the Hall viscosity of 2D hydrodynamic electron liquids
• Anomalous Hydrodynamic Transport in Interacting Noncentrosymmetric Metals
• Electron hydrodynamics of anomalous Hall materials

Cited by in corpus (4)

• Hall Coulomb drag induced by electron-electron skew scattering
• Hydrodynamic Navier-Stokes equations in two-dimensional systems with Rashba spin-orbit coupling
• Hydrodynamic Coulomb drag in odd electron liquids
• Selective damping of plasmons in coupled two-dimensional systems by Coulomb drag