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In this note, we show that the latest spin grating measurement of spin helixby Koralek {\em et al.} [Nature {\bf 458}, 610 (2009)] provides strong evidenceof the infinite spin diffusion length of any spin polarization along thedirection perpendicular to the effective magnetic field from the  Dresselhaus and Rashba spin-orbit couplings with identical strengths in$(001)$ GaAs quantum wells, predicted by Cheng {\em et al.} [Phys. Rev. B {\bf75}, 205328 (2007)].

journal of superconductivity and novel magnetism

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