Superballistic electron flow through a point contact in a Ga[Al]As heterostructure

Abstract

We measure electronic transport through point contacts in the high-mobility electron gas in a Ga[Al]As heterostructure at different temperatures and bulk electron densities. The conductance through all point contacts increases with increasing temperature in a temperature window around $T\sim 10K$ for all investigated electron densities and point contact widths. For high electron densities this conductance exceeds the fundamental ballistic limit (Sharvin limit). These observations are in agreement with a viscous electron transport model and previous experiments in graphene.

arXiv comment5 pages, 2 figures

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• Superballistic boundary conductance and hydrodynamic transport in microstructures
• Driving Viscous Hydrodynamics in Bulk Electron Flow in Graphene Using Micromagnets
• Hydrodynamics of the electronic Fermi liquid: a pedagogical overview
• Slip electron flow in GaAs microscale constrictions
• Nonequilibrium Relaxation and Odd-Even Effect in Finite-Temperature Electron Gases
• Superballistic paradox in electron fluids: Evidence of tomographic transport
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• Voltage characteristics of hydrodynamic Dirac electron nozzles with supersonic flow
• Geometric effects in the Dyakonov-Shur theory of Teraherz photodetection
• Theory of magnon hydrodynamics in collinear antiferromagnets