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| Main Authors: | , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2308.06056 |
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| _version_ | 1866917623126556672 |
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| author | Ginzburg, Lev V. Wu, Yuze Röösli, Marc P. Gomez, Pedro Rosso 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 |
| author_facet | Ginzburg, Lev V. Wu, Yuze Röösli, Marc P. Gomez, Pedro Rosso 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 |
| contents | 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 $μ$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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_06056 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Long distance electron-electron scattering detected with point contacts Ginzburg, Lev V. Wu, Yuze Röösli, Marc P. Gomez, Pedro Rosso 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 Mesoscale and Nanoscale Physics 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 $μ$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. |
| title | Long distance electron-electron scattering detected with point contacts |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2308.06056 |