Beats of Quantum Oscillations of the Resistance in Two-Subband Electron Systems in Tilted Magnetic Fields

• Published in: JETP letters 2019-03, Vol.109 (6), p.400-405
• Main Authors: Bykov, A. A., Strygin, I. S., Goran, A. V., Marchishin, I. V., Nomokonov, D. V., Bakarov, A. K., Abedi, S., Vitkalov, S. A.
• Format: Article
• Language: English
• Subjects: Atomic; Biological and Medical Physics; Biophysics; Condensed Matter; Cyclotron frequency; Cyclotrons; Electron transport; Magnetic fields; Magnetism; Molecular; Optical and Plasma Physics; Oscillations; Particle and Nuclear Physics; Physics; Physics and Astronomy; Quantum Information Technology; Quantum wells; Solid State Physics; Spintronics
• ISSN: 0021-3640; 1090-6487
• DOI: 10.1134/S0021364019060080

Electron transport in single GaAs quantum wells of widths from 22 to 46 nm with two populated quantum-confinement subbands E S and E AS is investigated at a temperature of T = 4.2 K in tilted magnetic fields B < 2 T. The angle α between the applied magnetic field and the normal to the plane of the structure under study is varied from 0° to 90°. In a perpendicular magnetic field (α = 0), magnetointersubband oscillations with a period determined by the relation Δ SAS = E AS - E S = jħ ω c , where ω c is the cyclotron frequency and j is a positive integer, are observed in all investigated quantum wells. In tilted fields, the peaks of magnetointersubband oscillations are shifted toward higher fields B cos α. This shift is explained by an increase in the energy splitting Δ SAS with increasing component B sin α. In 46- and 36-nm-wide quantum wells, beats of magnetointersubband oscillations are observed at angles α > 72° and α > 85°, respectively. The origin of this unexpected behavior of magnetointersubband oscillations in tilted magnetic fields is discussed.