Observation of current whirlpools in graphene at room temperature
arXiv:2408.00182 · doi:10.1126/science.adj2167
Abstract
Electron-electron interactions in high-mobility conductors can give rise to transport signatures resembling those described by classical hydrodynamics. Using a nanoscale scanning magnetometer, we imaged a distinctive hydrodynamic transport pattern - stationary current vortices - in a monolayer graphene device at room temperature. By measuring devices with increasing characteristic size, we observed the disappearance of the current vortex and thus verify a prediction of the hydrodynamic model. We further observed that vortex flow is present for both hole- and electron-dominated transport regimes, while disappearing in the ambipolar regime. We attribute this effect to a reduction of the vorticity diffusion length near charge neutrality. Our work showcases the power of local imaging techniques for unveiling exotic mesoscopic transport phenomena.
Main text and supplementary materials: 16 + 28 pages, 4 + 15 figures. This is the author's version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on 25 April 2024, DOI: 10.1126/science.adj2167
References in corpus (18)
- Boron nitride substrates for high-quality graphene electronics
- Fast pick up technique for high quality heterostructures of bilayer graphene and hexagonal boron nitride
- Hydrodynamics of electrons in graphene
- Single Ion Quantum Lock-In Amplifier
- Imaging phonon-mediated hydrodynamic flow in WTe2
- Non-local transport and the Hall viscosity of 2D hydrodynamic electron liquids
- Electron hydrodynamics dilemma: whirlpools or no whirlpools
- Hydrodynamic approach to two-dimensional electron systems
- Improved current density and magnetisation reconstruction through vector magnetic field measurements
- Finite temperature inelastic mean free path and quasiparticle lifetime in graphene
- Imaging Hydrodynamic Electrons Flowing Without Landauer-Sharvin Resistance
- Stokes paradox in electronic Fermi liquids
- Stokes flow around an obstacle in viscous two-dimensional electron liquid
- Nanoscale Electric Field Imaging with an Ambient Scanning Quantum Sensor Microscope
- Imaging ferroelectric domains with a single-spin scanning quantum sensor
- Imaging of sub-A currents in bilayer graphene using a scanning diamond magnetometer
- Superballistic electron flow through a point contact in a Ga[Al]As heterostructure
- Anti-Poiseuille flow in neutral graphene
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