The Kondo effect and mesoscopic quantum coherence in a 2D electron gas of magnetically undoped AlGaN/AlN/GaN heterostructures
We report an observation of the Kondo effect in two-dimensional electron gas (2DEG) of magnetically undoped AlGaN/GaN high electron mobility transistor heterostructures and analyze the 2DEG magnetoresistance oscillations to reveal the small-scale structure of the confining potential. Temperature-dep...
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Published in | Journal of physics. Conference series Vol. 1758; no. 1; pp. 12007 - 12011 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Bristol
IOP Publishing
01.01.2021
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Subjects | |
Online Access | Get full text |
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Summary: | We report an observation of the Kondo effect in two-dimensional electron gas (2DEG) of magnetically undoped AlGaN/GaN high electron mobility transistor heterostructures and analyze the 2DEG magnetoresistance oscillations to reveal the small-scale structure of the confining potential. Temperature-dependent zero-field resistivity data exhibit an appreciable upturn below 120 K, followed by the standard low-temperature weak-localization (WL) behaviour below 50 K, crossing over to a pronounced weak antilocalization (WAL) picture at T < 3 K. Magnetotransport characterization was carried out in the temperature range 100 mK ÷ 300 K in the magnetic fields B up to 8 T, applied perpendicular to the 2DEG plane. The Altshuler-Aronov-Spivak oscillations of the magnetoresistance with period h/2e, clearly observed against the background of its smooth behavior, are determined by the inhomogeneity of the 2 DEG confinement and allows to estimate its characteristic spatial scales. |
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ISSN: | 1742-6588 1742-6596 |
DOI: | 10.1088/1742-6596/1758/1/012007 |