Observation of current whirlpools in graphene at room temperature

• URL: http://arxiv.org/abs/2408.00182v1
• Date: Wed, 31 Jul 2024 22:29:27 GMT
• Title: Observation of current whirlpools in graphene at room temperature
• Authors: Marius L. Palm, Chaoxin Ding, William S. Huxter, Takashi Taniguchi, Kenji Watanabe, Christian L. Degen,
• Abstract summary: We image a distinctive hydrodynamic transport pattern - stationary current vortices - in a monolayer graphene device at room temperature. vortex flow is present for both hole- and electron-dominated transport regimes, while disappearing in the ambipolar regime. Our work showcases the power of local imaging techniques for unveiling exotic mesoscopic transport phenomena.
• Score: 0.1979158763744267
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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.

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