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

Abstract

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 allows us to attain long dephasing times in the nanoseconds range. The determination of the scales: 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.

5 pages, 5 figures

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Cited by in corpus (8)

• Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases
• Gate control of the spin mobility through the modification of the spin-orbit interaction in two-dimensional systems
• Long-lived nanosecond spin coherence in high-mobility 2DEGs confined in double and triple quantum wells
• Large anisotropic spin relaxation time of exciton bound to donor states in triple quantum wells
• Tailoring multilayer quantum wells for spin devices
• Macroscopic transport of a current-induced spin polarization
• Spin dependent analysis of homogeneous and inhomogeneous exciton decoherence in magnetic fields
• Electrostatic Langmuir and SEAWs in spin polarized plasma double layer