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arXiv 1209.1647cond-mat.mes-hallcond-mat.str-el
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自旋轨道耦合费米液体中的手征自旋波

Chiral Spin Waves in Fermi Liquids with Spin-Orbit Coupling

Ali Ashrafi, Dmitrii L. Maslov

摘要:

我们预言了具有Rashba或Dresselhaus自旋轨道耦合的二维费米液体中手征自旋波集体模的存在。从唯象的朗道理论出发,我们证明了长波长的磁化动力学是由克莱因-戈登方程。这些方程的驻波解描述了具有有效质量的“粒子”,其大小和符号取决于电子-电子相互作用的强度。任意波长的自旋手征模的光谱由相互作用顶点的Dyson方程确定。我们建议通过微波吸收的自旋轨道分裂的面内轮廓限制的驻波观察自旋手征模式。

英文摘要:

We predict the existence of chiral spin waves collective modes in a two-dimensional Fermi liquid with the Rashba or Dresselhaus spin-orbit coupling. Starting from the phenomenological Landau theory, we show that the long-wavelength dynamics of magnetization is governed by the Klein- Gordon equations. The standing-wave solutions of these equations describe "particles" with effective masses, whose magnitudes and signs depend on the strength of the electron-electron interaction. The spectrum of the spin-chiral modes for arbitrary wavelengths is determined from the Dyson equation for the interaction vertex. We propose to observe spin-chiral modes via microwave absorption of standing waves confined by an in-plane profile of the spin-orbit splitting.

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