Micromagnets dramatically enhance effects of viscous hydrodynamic flow in two-dimensional electron fluid

Abstract

The hydrodynamic behavior of electron fluids in a certain range of temperatures and densities is well established in graphene and in 2D semiconductor heterostructures. The hydrodynamic regime is intrinsically based on electron-electron interactions, and therefore it provides a unique opportunity to study electron correlations. Unfortunately, in all existing measurements, the relative contribution of hydrodynamic effects to transport is rather small. Viscous hydrodynamic effects are masked by impurities, interaction with phonons, uncontrolled boundaries and ballistic effects. This essentially limits the accuracy of measurements of electron viscosity. Fundamentally, what causes viscous friction in the electron fluid is the property of the flow called vorticity. In this paper, we propose to use micromagnets to increase the vorticity by orders of magnitude. Experimental realization of this proposal will bring electron hydrodynamics to a qualitatively new precision level, as well as opening a new way to characterize and externally control the electron fluid.

10 pages, 8 figure. Added references and fixed minor typos in the text to match published article

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Cited by in corpus (4)

• Driving Viscous Hydrodynamics in Bulk Electron Flow in Graphene Using Micromagnets
• Magnetic response of a two-dimensional viscous electron fluid
• Giant resonant skew scattering of plasma waves in a two-dimensional electron gas
• Tunable viscous layers in Corbino geometry using density junctions