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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 image a striking hydrodynamic transport patern – stationary current vortices – in a monolayer graphene device at room temperature. By measuring devices with increasing characteristic size, we observe the disappearance of the current vortex and thus verify a prediction of the hydrodynamic model. We further observe that vortex flow is present for both hole- and electron-dominated transport regimes, but disappears in the ambipolar regime. We atribute 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.

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  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 Volume 384, 25 Apr 2024, DOI:10.1126/science.adj2167.

Keyword: hydrodynamic transport, current vortex, graphene device

Date published: 2024-04-26

Publisher: American Association for the Advancement of Science (AAAS)

Journal:

• Science (ISSN: 10959203) vol. 384 issue. 6694 p. 465-469

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Manuscript type: Author's version (Accepted manuscript)

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First published URL: https://doi.org/10.1126/science.adj2167

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Updated at: 2025-07-23 16:30:35 +0900

Published on MDR: 2025-07-23 16:20:22 +0900