arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1310.7613cond-mat.mes-hallcond-mat.mtrl-sci
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集体自旋激发中自旋轨道场的库仑驱动组织和增强

Coulomb-driven organization and enhancement of spin-orbit fields in collective spin excitations

Florent Baboux, Florent Perez, Carsten A. Ullrich, Irene D'Amico, Grzegorz Karczewski, Tomasz Wojtowicz

摘要:

用角分辨非弹性光散射方法研究了自旋极化电子气中的自旋轨道(SO)场。我们展示了一个惊人的组织和增强的SO场作用于集体自旋激发(自旋翻转波)。虽然单个电子SO场具有广泛分布的动量依赖性,引起D 'yakonov-Perel'退相,但集体自旋动力学由单个集体SO场控制,该集体SO场由于多体效应而急剧增强。增强因子是实验确定的。这些结果提供了一个强有力的指示,这些建设性的现象是普遍的集体自旋激发的导电系统。

英文摘要:

Spin-orbit (SO) fields in a spin-polarized electron gas are studied by angle-resolved inelastic light scattering on a CdMnTe quantum well. We demonstrate a striking organization and enhancement of SO fields acting on the collective spin excitation (spin-flip wave). While individual electronic SO fields have a broadly distributed momentum dependence, giving rise to D'yakonov-Perel' dephasing, the collective spin dynamics is governed by a single collective SO field which is drastically enhanced due to many-body effects. The enhancement factor is experimentally determined. These results provide a powerful indication that these constructive phenomena are universal to collective spin excitations of conducting systems.

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