Long-lived nanosecond spin coherence in high-mobility 2DEGs confined in double and triple quantum wells

Journal Article · Tue Jun 07 04:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4953007· OSTI ID:22596769

Ullah, S.; Gusev, G. M.; Hernandez, F. G. G., ^[1]; Bakarov, A. K. ^[2]

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1. Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, CEP 05315-970 São Paulo, SP (Brazil)
2. Institute of Semiconductor Physics and Novosibirsk State University, Novosibirsk 630090 (Russian Federation)

We investigated the spin coherence of high-mobility two-dimensional electron gases confined in multilayer GaAs quantum wells. The dynamics of the spin polarization was optically studied using pump-probe techniques: time-resolved Kerr rotation and resonant spin amplification. For double and triple quantum wells doped beyond the metal-to-insulator transition, the spin-orbit interaction was tailored by the sample parameters of structural symmetry (Rashba constant), width, and electron density (Dresselhaus linear and cubic constants) which allow us to attain long dephasing times in the nanoseconds range. The determination of the scales, namely, transport scattering time, single-electron scattering time, electron-electron scattering time, and spin polarization decay time further supports the possibility of using n-doped multilayer systems for developing spintronic devices.

• OSTI ID: 22596769
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 21 Vol. 119; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMPLIFICATION
DOPED MATERIALS
ELECTRON DENSITY
ELECTRON-ELECTRON COLLISIONS
ELECTRON-ELECTRON INTERACTIONS
ELECTRONS
GALLIUM ARSENIDES
L-S COUPLING
LAYERS
QUANTUM WELLS
SCATTERING
SPIN
SPIN ORIENTATION
TIME RESOLUTION
TWO-DIMENSIONAL CALCULATIONS