Persistent spin helix in Rashba-Dresselhaus two-dimensional electron systems

Abstract

A persistent spin helix (PSH) in spin-orbit-coupled two-dimensional electron systems was recently predicted to exist in two cases: [001] quantum wells (QWs) with equal coupling strengths of the Rashba and the Dresselhaus interactions (RD), and Dresselhaus-only [110] QWs. Here we present supporting results and further investigations, using our previous results [Phys. Rev. B 72, 153305 (2005)]. Refined PSH patterns for both RD [001] and Dresselhaus [110] QWs are shown, such that the feature of the helix is clearly seen. We also discuss the time dependence of spin to reexamine the origin of the predicted persistence of the PSH. For the RD [001] case, we further take into account the random Rashba effect, which is much more realistic than the constant Rashba model. The distorted PSH pattern thus obtained suggests that such a PSH may be more observable in the Dresselhaus [110] QWs, if the dopants cannot be regularly enough distributed.

6 pages, 4 figures

References in corpus (6)

• An Exact SU(2) Symmetry and Persistent Spin Helix in a Spin-Orbit Coupled System
• Suppression of Spin Relaxation in Submicron InGaAs Wires
• Spin precession due to spin-orbit coupling in a two-dimensional electron gas with spin injection via ideal quantum point contact
• Nonuniform Rashba-Dresselhaus spin precession along arbitrary paths
• Datta-Das transistor: Significance of channel direction, size-dependence of source contacts, and boundary effects
• Spin precession in inversion-asymmetric two-dimensional systems

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• Spin relaxation and combined resonance in two-dimensional electron systems with spin-orbit disorder
• Spin polarization in biased Rashba-Dresselhaus two-dimensional electron systems
• Nonequilibrium spin transport on Au(111) surfaces
• Understanding spin Hall effects from the motion in SU(2)XU(1) fields
• Understanding spin transport from the motion in SU(2)$\times$U(1) fields