Non-diffusive spin dynamics in a two-dimensional electron gas

Abstract

We describe measurements of spin dynamics in the two-dimensional electron gas in GaAs/GaAlAs quantum wells. Optical techniques, including transient spin-grating spectroscopy, are used to probe the relaxation rates of spin polarization waves in the wavevector range from zero to $6\times 10^4$ cm${}^{-1}$. We find that the spin polarization lifetime is maximal at nonzero wavevector, in contrast with expectation based on ordinary spin diffusion, but in quantitative agreement with recent theories that treat diffusion in the presence of spin-orbit coupling.

5 pages, 3 figures

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• Spin Hall effect
• Universal Intrinsic Spin-Hall Effect
• Dissipationless Quantum Spin Current at Room Temperature
• Experimental observation of the spin-Hall effect in a two dimensional spin-orbit coupled semiconductor system
• Non-ballistic spin field-effect transistor
• An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System
• Spatial imaging of the spin Hall effect and current-induced polarization in two-dimensional electron gases
• Current induced electron spin polarization in strained semiconductors
• Giant Spin Relaxation Anisotropy in Zinc-Blende Heterostructures
• Theory of Spin-Charge Coupled Transport in a Two-Dimensional Electron Gas with Rashba Spin-Orbit Interactions
• Observation of spin Coulomb drag in a two-dimensional electron gas
• Observation of Spin Relaxation Anisotropy in Semiconductor Quantum Wells
• Zero-bias spin separation

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• Modeling of diffusion of injected electron spins in spin-orbit coupled microchannels
• Measurement of spin diffusion in semi-insulating GaAs
• Infinite spin diffusion length of any spin polarization along direction perpendicular to effective magnetic field from Dresselhaus and Rashba spin-orbit couplings with identical strengths in (001) GaAs quantum wells
• Direct imprinting of arbitrary spin textures using programmable structured light in a semiconductor two-dimensional electron gas
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• Current-induced spin polarisation in Rashba-Dresselhaus systems under different point groups
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• Microscopic theory for the Doppler velocimetry of spin propagation in semiconductor quantum wells
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