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Electron-electron interactions in graphene are sufficiently strong to induce a correlated and momentum-conserving flow such that charge carriers behave similarly to the Hagen-Poiseuille flow of a classical fluid. In the current work, we investigate the electronic signatures of such a viscous charge flow in high-mobility graphene FETs. In two complementary measurement schemes, we monitor differential resistance of graphene for different channel widths and for different effective electron temperatures. By combining both approaches, the presence of viscous effects is verified in a temperature range starting from 178 K and extending up to room temperature. Our experimental findings are supported by finite element calculations of the graphene channel, which also provide design guidelines for device geometries that exhibit increased viscous effects. The presence of vis- cous effects near room temperature opens up avenues for functional hydrodynamic devices such as geometric rectifiers like a Tesla valve and charge amplifiers based on electronic Venturi effect.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Electron-electron interactions, graphene, viscous charge flow

刊行年月日: 2023-05-01

出版者: American Physical Society (APS)

掲載誌:

• Physical Review Research (ISSN: 26431564) vol. 5 issue. 2 023075

研究助成金:

• Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung 189924
• Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung 196795
• Japan Society for the Promotion of Science 19H05790
• Japan Society for the Promotion of Science 20H00354
• Scientific Education and Research Institute MB22.00076

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1103/physrevresearch.5.023075

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更新時刻: 2025-02-23 22:47:11 +0900

MDRでの公開時刻: 2025-02-23 22:47:12 +0900