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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.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Electron transport, point contacts, magnetoconductance

刊行年月日: 2023-10-26

出版者: American Physical Society (APS)

掲載誌:

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

研究助成金:

• 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

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1103/physrevresearch.5.043088

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更新時刻: 2025-02-23 22:47:26 +0900

MDRでの公開時刻: 2025-02-23 22:47:26 +0900