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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2408.00182 |
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| _version_ | 1866916342119006208 |
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| author | Palm, Marius L. Ding, Chaoxin Huxter, William S. Taniguchi, Takashi Watanabe, Kenji Degen, Christian L. |
| author_facet | Palm, Marius L. Ding, Chaoxin Huxter, William S. Taniguchi, Takashi Watanabe, Kenji Degen, Christian L. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_00182 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of current whirlpools in graphene at room temperature Palm, Marius L. Ding, Chaoxin Huxter, William S. Taniguchi, Takashi Watanabe, Kenji Degen, Christian L. Mesoscale and Nanoscale Physics Strongly Correlated Electrons Quantum Physics 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. |
| title | Observation of current whirlpools in graphene at room temperature |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons Quantum Physics |
| url | https://arxiv.org/abs/2408.00182 |