Spin-orbit dependence on carrier momentum in (110) GaAs quantum wells

被引：2

作者：

Couto, O. D. D., Jr. ^{[1
]}

Rudolph, J. ^{[1
]}

Iikawa, F. ^{[2
]}

Hey, R. ^{[1
]}

Santos, P. V. ^{[1
]}

机构：

[1] Paul Drude Inst Festkorperelekt, D-10117 Berlin, Germany

[2] Univ Estadual Campinas, IFGW, BR-13083970 Campinas, SP, Brazil

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2008年 / 40卷 / 06期

关键词：

spin transport; (110) GaAs quantum wells; surface acoustic waves; semiconductors;

D O I：

10.1016/j.physe.2007.08.116

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 [材料科学与工程]; 080502 [材料学];

摘要：

Surface acoustic waves (SAW) are employed to transport optically generated spin ensembles over distances exceeding 60 gm in (110) 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 [001] direction, the high relaxation rates for the in-plane spin component lead to fast spin decoherence under a magnetic field. For the [(1) over bar 10] direction, in contrast, a non-zero average value of the SO internal magnetic field retards the longitudinal spin relaxation. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：1797 / 1799

页数：3

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