Macroscopic transverse drift of long current-induced spin coherence in two-dimensional electron gases

Abstract

We imaged the transport of current-induced spin coherence in a two-dimensional electron gas confined in a triple quantum well. Nonlocal Kerr rotation measurements, based on the optical resonant amplification of the electrically-induced polarization, revealed a large spatial variation of the electron g factor and the efficient generation of a current controlled spin-orbit field in a macroscopic Hall bar device. We observed coherence times in the nanoseconds range transported beyond half-millimeter distances in a direction transverse to the applied electric field. The measured long spin transport length can be explained by two material properties: large mean free path for charge diffusion in clean systems and enhanced spin-orbit coefficients in the triple well.

12 pages, 13 figures

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Cited by in corpus (10)

• Gate control of the spin mobility through the modification of the spin-orbit interaction in two-dimensional systems
• Large anisotropic spin relaxation time of exciton bound to donor states in triple quantum wells
• Electrical control of spin relaxation anisotropy during drift transport in a two-dimensional electron gas
• Tailoring multilayer quantum wells for spin devices
• Spin drift-diffusion for two-subband quantum wells
• Macroscopic transport of a current-induced spin polarization
• Charge-Spin Conversion in Two-Subband Quantum Wells with Conventional and Unconventional Rashba Spin-Orbit Coupling
• Experimental analysis of the spin-orbit coupling dependence on the drift velocity of a spin packet
• Optically-detected long-lived spin coherence in multilayer systems: Double and triple quantum wells
• Luminescence imaging of photoelectron spin precession during drift in p-type GaAs