Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2004-02-09
Phys. Rev. B, v. 71 (4), 045313 (2005)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
v1: 5 pages, 2 figures, submitted to PRL v2: added 1 figure and supporting content, PRB format
Scientific paper
10.1103/PhysRevB.71.045313
We apply the D'yakonov-Perel' (DP) formalism to [111]-grown zincblende quantum wells (QWs) to compute the spin lifetimes of electrons in the two-dimensional electron gas. We account for both bulk and structural inversion asymmetry (Rashba) effects. We see that, under certain conditions, the spin splitting vanishes to first order in k, which effectively suppresses the DP spin relaxation mechanism for all spin components. We predict extended spin lifetimes as a result, giving rise to the possibility of enhanced spin storage. We also study [110]-grown QWs, where the effect of structural inversion asymmetry is to augment the spin relaxation rate of the component perpendicular to the well. We derive analytical expressions for the spin lifetime tensor and its proper axes, and see that they are dependent on the relative magnitude of the BIA- and SIA-induced splittings.
Cartoixa Xavier
Chang Yen-Chang
Ting D. Z. -Y.
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