Gate-Control of Anisotropic Spin Transport and Spin Helix Dynamics in a Modulation-Doped GaAs Quantum Well

Abstract

Electron spin transport and dynamics are investigated in a single, high-mobility, modulation-doped, GaAs quantum well using ultrafast two-color Kerr-rotation micro-spectroscopy, supported by qualitative kinetic theory simulations of spin diffusion and transport. Evolution of the spins is governed by the Dresselhaus bulk and Rashba structural inversion asymmetries, which manifest as an effective magnetic field that can be extracted directly from the experimental coherent spin precession. A spin precession length L-SOI is defined as one complete precession in the effective magnetic field. It is observed that application of (a) an out-of-plane electric field changes the spin decay time and L-SOI through the Rashba component of the spin-orbit coupling, (b) an in-plane magnetic field allows for extraction of the Dresselhaus and Rashba parameters, and (c) an in-plane electric field markedly modifies both the L-SOI and diffusion coefficient. While simulations reproduce the main features of the experiments, the latter results exceed the corresponding simulations and extend previous studies of drift-current-dependent spin-orbit interactions.

arXiv comment11 pages, 7 figures

References in corpus (14)

• New Perspectives for Rashba Spin-Orbit Coupling
• An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System
• Emergence of the persistent spin helix in semiconductor quantum wells
• Direct mapping of the formation of a persistent spin helix: Supplementary information
• Coherent Electronic Coupling in Atomically Thin MoSe2
• Direct determination of spin orbit interaction coefficients and realization of the persistent spin helix symmetry
• Symmetry and spin dephasing in (110)-grown quantum wells
• Ambipolar spin diffusion and D'yakonov-Perel' spin relaxation in GaAs quantum wells
• Dynamics of a localized spin excitation close to the spin-helix regime
• Current-controlled Spin Precession of Quasi-Stationary Electrons in a Cubic Spin-Orbit Field
• Spin dephasing and photoinduced spin diffusion in high-mobility 110-grown GaAs-AlGaAs two-dimensional electron systems
• Spatiotemporal spin fluctuations caused by spin-orbit-coupled Brownian motion
• Ultrafast supercontinuum fiber-laser based pump-probe scanning MOKE microscope for the investigation of electron spin dynamics in semiconductors at cryogenic temperatures with picosecond time and micrometer spatial resolution
• Enhanced spin lifetimes in a two dimensional electron gas in a gate-controlled GaAs quantum well

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