Magnetic breakdown and quantum magnetotransport with a constant pseudospin under tilted magnetic fields in an n-In{sub x}Ga{sub 1-x}As/GaAs double quantum well
- Russian Academy of Sciences, Institute of Metal Physics, Ural Division (Russian Federation)
A procedure is proposed for precise scanning of the (B{sub perpendicular}, B{sub parallel}) 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{sub x}Ga{sub 1-x}As/GaAs double quantum well (x {approx} 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{sub perpendicular} , B{sub parallel}) 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 Lande factor vertical bar g* vertical bar {approx} 3.
- OSTI ID:
- 21075775
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 105, Issue 1; Other Information: DOI: 10.1134/S1063776107070485; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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