Anomalous electronic transport in high-mobility Corbino rings

We report low-temperature electronic transport measurements performed in two multi-terminal Corbino samples formed in GaAs/Al-GaAs two-dimensional electron gases (2DEG) with both ultra-high electron mobility ( ≳ 20 × 10 6  cm 2 / Vs) and with distinct electron density of 1.7 and 3.6 × 10 11  cm −2 ....

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Veröffentlicht in:Nature communications 2023-07, Vol.14 (1), p.3906-3906, Article 3906
Hauptverfasser: Vijayakrishnan, Sujatha, Poitevin, F., Yu, Oulin, Berkson-Korenberg, Z., Petrescu, M., Lilly, M. P., Szkopek, T., Agarwal, Kartiek, West, K. W., Pfeiffer, L. N., Gervais, G.
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Sprache:eng
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Zusammenfassung:We report low-temperature electronic transport measurements performed in two multi-terminal Corbino samples formed in GaAs/Al-GaAs two-dimensional electron gases (2DEG) with both ultra-high electron mobility ( ≳ 20 × 10 6  cm 2 / Vs) and with distinct electron density of 1.7 and 3.6 × 10 11  cm −2 . In both Corbino samples, a non-monotonic behavior is observed in the temperature dependence of the resistance below 1 K. Surprisingly, a sharp decrease in resistance is observed with increasing temperature in the sample with lower electron density, whereas an opposite behavior is observed in the sample with higher density. To investigate further, transport measurements were performed in large van der Pauw samples having identical heterostructures, and as expected they exhibit resistivity that is monotonic with temperature. Finally, we discuss the results in terms of various lengthscales leading to ballistic and hydrodynamic electronic transport, as well as a possible Gurzhi effect. Metallic resistance of two-dimensional electron gases normally increases with temperature increasing. Here, the authors find a resistance decrease with increasing temperature at very low temperatures in two-dimensional electron metal described by Fermi liquid theory.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-023-39526-x