Geometric engineering of viscous magnetotransport in a two-dimensional electron system

Abstract

In this study, we present our experimental investigation on the magnetotransport properties of a two-dimensional electron system in GaAs quantum wells utilizing a variety of device geometries, including obstacles with thin barriers and periodic width variations. Our primary focus is to explore the impact of these geometries on the electron viscous flow parameters, enabling precise manipulation of hydrodynamic effects under controlled conditions. Through an analysis of the large negative magnetoresistivity and zero field resistivity, we deduce the scattering times for electron-electron and electron-phonon interactions, as well as the effective channel width. Our findings confirm that the system under investigation serves as a tunable experimental platform for investigating hydrodynamic transport regimes at temperatures above 10 K.

10 pages, 11 figures

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• Obstacle-Induced Gurzhi Effect and Hydrodynamic Electron Flow in Two-Dimensional Systems
• Driving Viscous Hydrodynamics in Bulk Electron Flow in Graphene Using Micromagnets
• Bulk and shear viscosities in multicomponent 2D electron system
• Electron Hydrodynamics and Bernoulli Effect in Venturi-Shaped 2D Systems
• Corbino-Enhanced Supersonic Acoustic-Emission Threshold in a GaAs Two-Dimensional Electron System
• Tunable viscous layers in Corbino geometry using density junctions