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arXiv 0705.2419cond-mat.mes-hall
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具有Rashba自旋轨道耦合的清洁二维电子气在有限动量和频率下的电荷和自旋密度响应函数

Charge and spin density response functions of the clean two-dimensional electron gas with Rashba spin-orbit coupling at finite momenta and frequencies

M. Pletyukhov, S. Konschuh

摘要:

我们分析评估的电荷和自旋密度响应函数的清洁的二维电子气与Rashba自旋轨道耦合在有限的动量和频率。在此基础上讨论了长波近似和准经典近似的精度。我们还推导出自旋极化率的静态极限,特别是证明了它们的导数中的Kohn异常与Ruderman-Kittel-Kasuya-Yosida相互作用的自旋轨道修正有关。考虑到屏蔽和交换效应的库仑相互作用,我们描述了集体电荷和自旋密度激发模式,出现耦合由于非零自旋-电荷响应函数。

英文摘要:

We analytically evaluate charge and spin density response functions of the clean two-dimensional electron gas with Rashba spin-orbit coupling at finite momenta and frequencies. On the basis of our exact expressions we discuss the accuracy of the long-wavelength and the quasiclassical approximations. We also derive the static limit of spin susceptibilities and demonstrate, in particular, how the Kohn-like anomalies in their derivatives are related to the spin-orbit modification of the Ruderman-Kittel-Kasuya-Yosida interaction. Taking into account screening and exchange effects of the Coulomb interaction, we describe the collective charge and spin density excitation modes which appear to be coupled due to nonvanishing spin-charge response function.

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