Keywords :
Bulk electrons; Electron flow; Electron fluid; Hydrodynamic flows; Micromagnets; No-slip boundary conditions; Periodic magnetic fields; Two-dimensional electron gases (2DEG); Viscous boundary layers; Voltage modulations; Electronic, Optical and Magnetic Materials; Condensed Matter Physics; Physics - Mesoscopic Systems and Quantum Hall Effect
Abstract :
[en] We consider the hydrodynamic flow of an electron fluid in a channel formed in a two-dimensional electron gas (2DEG) with no-slip boundary conditions. To generate vorticity in the fluid, the flow is influenced by an array of micromagnets on the top of the 2DEG. We analyze the viscous boundary layer, and we demonstrate anti-Poiseuille behavior in this region. Furthermore, we predict a longitudinal voltage modulation, where a periodic magnetic field generates a voltage term periodic in the direction of transport. From an experimental point of view, we propose a method for a boundary-independent measurement of the viscosity of different electron fluids. The results are applicable to graphene away from the charge-neutrality point and to semiconductors.
Funding text :
We acknowledge important discussions with A. Hamilton, Y. A. Alava, O. Klochan, D. Wang, and Z. Krix. This work was supported by the Australian Research Council Centre of Excellence in Future Low-Energy Electronics Technologies (CE170100039).
Commentary :
13 pages, 7 figures. V2: Typos fixed and additional discussion added. Analysis of the bulk flow expanded to include subleading corrections to the Navier-Stokes equation. The solution for the boundary layer has been generalized to finite slip length in Appendix B
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