Magnetoresistance in a high-mobility two-dimensional electron gas
نویسندگان
چکیده
منابع مشابه
Linear Magnetoresistance in a Quasifree Two-Dimensional Electron Gas in an Ultrahigh Mobility GaAs Quantum Well.
We report a high-field magnetotransport study of an ultrahigh mobility (μ[over ¯]≈25×10^{6} cm^{2} V^{-1} s^{-1}) n-type GaAs quantum well. We observe a strikingly large linear magnetoresistance (LMR) up to 33 T with a magnitude of order 10^{5}% onto which quantum oscillations become superimposed in the quantum Hall regime at low temperature. LMR is very often invoked as evidence for exotic qu...
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J. Kunc,1,2,* B. A. Piot,1 D. K. Maude,1 M. Potemski,1 R. Grill,2 C. Betthausen,3 D. Weiss,3 V. Kolkovsky,4 G. Karczewski,4 and T. Wojtowicz4 1Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS-UJF-UPS-INSA, 38042 Grenoble, France 2Institute of Physics, Faculty of Mathematics and Physics, 12116 Prague, Czech Republic 3Experimentelle und Angewandte Physik, Universität Regensburg,...
متن کاملMagnetoresistance in a High Mobility Two-Dimensional Electron System as a Function of Sample Geometry
In a high mobility two-dimensional electron gas (2DEG) realized in a GaAs / Al0.3Ga0.7As quantum well we observe changes in the Shubnikov-de Haas oscillations (SdHO) and in the Hall resistance for different sample geometries. We observe for each sample geometry a strong negative magnetoresistance around zero magnetic field which consists of a peak around zero magnetic field and of a huge magnet...
متن کاملSeries of magnetoresistance oscillations of a two-dimensional electron gas in a strong periodic magnetic modulation
A nonperturbative technique is used to calculate the magnetoresistance of two-dimensional electron gases ~2DEG! subjected to a spatially periodic magnetic field B1 with period a in addition to a uniform magnetic field B0 in the same direction. For small amplitude modulation, magnetoresistance exhibits oscillations similar to the Weiss oscillations observed in 2DEG under spatially periodic elect...
متن کاملMagnetoresistance of a two-dimensional electron gas in a random magnetic field.
We report magnetoresistance measurements on a two-dimensional electron gas (2DEG) made from a high mobility GaAs/AlGaAs heterostructure, where the externally applied magnetic field was expelled from regions of the semiconductor by means of superconducting lead grains randomly distributed on the surface of the sample. A theoretical explanation in excellent agreement with the experiment is given ...
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ژورنال
عنوان ژورنال: Physical Review B
سال: 2011
ISSN: 1098-0121,1550-235X
DOI: 10.1103/physrevb.83.113301