Department of Physics, University of Florida, P.O. Box 118440, Gainesville, Florida 32611-8440, USA.
Phys Rev Lett. 2012 Nov 30;109(22):227201. doi: 10.1103/PhysRevLett.109.227201. Epub 2012 Nov 27.
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 by standing waves confined by an in-plane profile of the spin-orbit splitting.
我们预测在具有拉什巴或 Dresselhaus 自旋轨道耦合的二维费米液体中存在手性自旋波-集体模式。从唯象的 Landau 理论出发，我们表明磁化的长波长动力学由 Klein-Gordon 方程控制。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。自旋手性模式的谱由相互作用顶点的 Dyson 方程确定。我们建议通过由自旋轨道分裂的面内轮廓限制的驻波的微波吸收来观察自旋手性模式。
