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We measure electron transport through point contacts in an electron gas in GaAs heterostructures and graphene for a range of temperatures, magnetic fields and electron densities. We find a magne- toconductance peak around B = 0. With increasing temperature, the width of the peak increases monotonically, while its amplitude first increases and then decreases. For GaAs point contacts the peak is particularly sharp at relatively low temperatures T ∼ 1.5K: the curve rounds on a scale of few tens of μT hinting at length scales of several millimeters for the corresponding scattering processes. We propose a model based on the transition between different transport regimes with in- creasing temperature: from ballistic transport to few electron-electron scatterings to hydrodynamic superballistic flow to hydrodynamic Poiseuille-like flow. The model is in qualitative and, in many cases, quantitative agreement with the experimental observations.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Electron transport, point contacts, magnetoconductance

Date published: 2023-10-26

Publisher: American Physical Society (APS)

Journal:

• Physical Review Research (ISSN: 26431564) vol. 5 issue. 4 043088

Funding:

• H2020 European Research Council 951541
• HORIZON EUROPE Marie Sklodowska-Curie Actions 766025
• Eidgenössische Technische Hochschule Zürich
• Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
• National Center of Competence in Research Quantum Science and Technology
• Japan Society for the Promotion of Science 19H05790
• Japan Society for the Promotion of Science 20H00354

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1103/physrevresearch.5.043088

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Updated at: 2025-02-23 22:47:26 +0900

Published on MDR: 2025-02-23 22:47:26 +0900