Magnetic breakdown and quantum magnetotransport with a constant pseudospin under tilted magnetic fields in an n -In x Ga1? x As/GaAs double quantum well |
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Authors: | M V Yakunin S M Podgornykh and V N Neverov |
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Institution: | (1) Institute of Metal Physics, Ural Division, Russian Academy of Sciences, Yekaterinburg, 620041, Russia |
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Abstract: | A procedure is proposed for precise scanning of the (B
⊥, B
‖) plane between the magnetic field projections that are perpendicular and parallel to (quasi-)two-dimensional layers when
measuring their longitudinal and Hall magnetoresistances. Investigations of a n-In
x
Ga1−x
As/GaAs double quantum well (x ≈ 0.2) performed using this procedure make it possible to reveal a number of the features of the magnetoresistance, which
appear due to a complex energy spectrum of the double quantum well in a parallel field, and to separate them from the structures
associated with the magnetic breakdown. The trajectories representing the features of the magnetoresistance in the (B
⊥, B
‖) plane are described by the semiclassical calculations of the quantization of the energy spectrum of the double quantum well
under the action of the perpendicular field component. The structures appearing due to the magnetic breakdown are amplified
with increasing the total magnetic field magnitude and, in the samples with low mobility, completely suppress the features
caused by the motion of an electron with a constant pseudospin component. The peaks corresponding to the magnetic breakdown
are split in a strong parallel field due to the spin splitting of the Landau levels. These splittings correspond to the effective
Landé factor |g*| ≈ 3.
Original Russian Text ? M.V. Yakunin, S.M. Podgornykh, V.N. Neverov, 2007, published in Zhurnal éksperimental’noĭ i Teoreticheskoĭ
Fiziki, 2007, Vol. 132, No. 1, pp. 241–249. |
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Keywords: | |
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