Long distance electron-electron scattering detected with point contacts

We measure electron transport through point contacts in an electron gas in AlGaAs/GaAs heterostructures and graphene for a range of temperatures, magnetic fields and electron densities. We find a magnetoconductance peak around B = 0. With increasing temperature, the width of the peak increases monot...

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Bibliographic Details
Published in:arXiv.org 2023-08
Main Authors: Ginzburg, Lev V, Wu, Yuze, Röösli, Marc P, Pedro Rosso Gomez, Garreis, Rebekka, Tong, Chuyao, Stará, Veronika, Gold, Carolin, Nazaryan, Khachatur, Kryhin, Serhii, Overweg, Hiske, Reichl, Christian, Berl, Matthias, Taniguchi, Takashi, Watanabe, Kenji, Wegscheider, Werner, Ihn, Thomas, Ensslin, Klaus
Format: Article
Language:English
Subjects:
Electron gas
Electron transport
Graphene
Heterostructures
Low temperature
Scattering
Online Access:Get full text
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Summary:We measure electron transport through point contacts in an electron gas in AlGaAs/GaAs heterostructures and graphene for a range of temperatures, magnetic fields and electron densities. We find a magnetoconductance 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 \(T\approx\)1.5 K: the curve rounds on a scale of few tens of \(\mu\)T 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 increasing 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.
ISSN:2331-8422
DOI:10.48550/arxiv.2308.06056