Article (Scientific journals)
Driving viscous hydrodynamics in bulk electron flow in graphene using micromagnets
Engdahl, Jack N.; Keser, Aydln Cem; SCHMIDT, Thomas et al.
2024In Physical Review. B, 109 (19)
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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.
Disciplines :
Physics
Author, co-author :
Engdahl, Jack N. ;  School of Physics, University of New South Wales, Sydney, Australia
Keser, Aydln Cem ;  CSIRO, West Lindfield, Australia
SCHMIDT, Thomas ;  University of Luxembourg > Faculty of Science, Technology and Medicine (FSTM) > Department of Physics and Materials Science (DPHYMS) ; School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
Sushkov, Oleg P.;  School of Physics, University of New South Wales, Sydney, Australia
External co-authors :
yes
Language :
English
Title :
Driving viscous hydrodynamics in bulk electron flow in graphene using micromagnets
Publication date :
15 May 2024
Journal title :
Physical Review. B
ISSN :
2469-9950
eISSN :
2469-9969
Publisher :
American Physical Society
Volume :
109
Issue :
19
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
Centre of Excellence in Future Low-Energy Electronics Technologies, Australian Research Council
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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