We suggest a long-lived spin-polarization structure, a radial spin helix, and study its relaxation dynamics. For this purpose, starting with a system of equations for spin-polarization density, we find its general solution in the axially symmetric case. It is demonstrated that the radial spin helix of a certain period relaxes slower than homogeneous spin polarization and plain spin helix. Importantly, the spin polarization at the center of the radial spin helix stays almost unchanged at short times. At longer times, when the initial nonexponential relaxation region ends, the relaxation of the radial spin helix occurs with the same time constant as that describing the relaxation of the plain spin helix.
Published in Physical Review B, ed. Gene D. Sprouse, Volume 82, Issue 12, 2010, pages 125325-1-125325-8.
Pershin, Y. V., & Slipko, V. A. (2010). Radial spin helix in tow-dimensional electron systems with Rashba spin-orbit coupling. Physical Review B, 8 29(12), 125325-1 - 125325-8. DOI: 10.1103/PhysRevB.82.125325
© Physical Review B, 2010, American Physical Society