Coulomb-driven organization and enhancement of spin-orbit fields in collective spin excitations
Coulomb-driven organization and enhancement of spin-orbit fields in collective spin excitations
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DOI：
10.1103/physrevb.87.121303
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发表时间：
2013-03-21
影响因子：
3.7
通讯作者：
Wojtowicz, T.
中科院分区：
文献类型：
--
作者：
Baboux, F.;Perez, F.;Wojtowicz, T.
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。DOI：10.1103/PhysRevB.87.121303
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. DOI: 10.1103/PhysRevB.87.121303