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Spin–orbit dependence on carrier momentum in (1 1 0) GaAs quantum wells

✍ Scribed by O.D.D. Couto Jr.; J. Rudolph; F. Iikawa; R. Hey; P.V. Santos

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
148 KB
Volume
40
Category
Article
ISSN
1386-9477

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✦ Synopsis

Surface acoustic waves (SAW) are employed to transport optically generated spin ensembles over distances exceeding 60 mm in (1 1 0) GaAs quantum wells (QW). The dependence of the spin-orbit (SO) coupling on carrier momentum is investigated by using SAWs to transport spins with well-defined velocity along different directions in the QW plane. For transport along the [0 0 1] direction, the high relaxation rates for the in-plane spin component lead to fast spin decoherence under a magnetic field. For the ½ 1 1 0 direction, in contrast, a non-zero average value of the SO internal magnetic field retards the longitudinal spin relaxation.

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