Anomalous magnetic suppression of spin relaxation in a two-dimensional electron gas in a GaAs/AlGaAs quantum well

We study the spin dynamics in a high-mobility two-dimensional electron gas confined in a GaAs/AlGaAs quantum well. An unusual magnetic field dependence of the spin relaxation is found: As the magnetic field becomes stronger, the spin relaxation time first increases quadratically but then changes to...

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Bibliographic Details
Published in:Physical review. B 2020-06, Vol.101 (23), p.1, Article 235307
Main Authors: Belykh, V. V., Kochiev, M. V., Sob'yanin, D. N., Yakovlev, D. R., Bayer, M.
Format: Article
Language:English
Subjects:
Aluminum gallium arsenides
Dependence
Electron gas
Electron spin
Electrons
Low temperature
Magnetic fields
Magnetic induction
Oscillations
Plasmas (physics)
Quantum wells
Relaxation time
Spin dynamics
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Summary:We study the spin dynamics in a high-mobility two-dimensional electron gas confined in a GaAs/AlGaAs quantum well. An unusual magnetic field dependence of the spin relaxation is found: As the magnetic field becomes stronger, the spin relaxation time first increases quadratically but then changes to a linear dependence before it eventually becomes oscillatory, whereby the longitudinal and transverse times reach maximal values at even and odd filling Landau level factors, respectively. We show that the suppression of spin relaxation is due to the effect of electron gyration on the spin-orbit field, while the oscillations correspond to oscillations of the density of states appearing at low temperatures and high magnetic fields. The transition from quadratic to linear dependence can be related to a transition from classical to Bohm diffusion and reflects an anomalous behavior of the two-dimensional electron gas analogous to that observed in magnetized plasmas.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.101.235307