论文标题
Rashba材料中的自旋依赖性电子相互作用
Spin-dependent electron-electron interaction in Rashba materials
论文作者
论文摘要
我们回顾了这对旋转轨道相互作用（PSOI）对RashBA材料的影响。 PSOI是电子 - 电子相互作用成分，取决于电子的自旋和动量。它是由相互作用电子的库仑田地产生的，它已经存在于真空中，但在具有巨大的Rashba效应的材料中变为数量级。 PSOI的主要非平凡特征是，它对与其动量相关的某些自旋构型中的电子具有吸引力，并与电子的库仑排斥力竞争。在某些条件下，在现代低维结构中可以实现PSOI占上风。电子之间产生的吸引力导致结合电子对的形成，其结合能可以通过电气均值控制。在多电子系统中，PSOI导致基态下态的不稳定性相对于密度波动的不稳定性，该密度波动在不同的空间尺度上发展，具体取决于产生PSOI的电场的几何形状。如果PSOI不太强，电子系统是稳定的，但是其集体激发揭示了高度不寻常的自旋结构和频谱，这在动态电导率的频率依赖性中表现出来。
We review the effects of the pair spin-orbit interaction (PSOI) in Rashba materials. The PSOI is the electron-electron interaction component that depends on the spin and momentum of the electrons. Being produced by the Coulomb fields of interacting electrons, it exists already in vacuum, but becomes orders of magnitude larger in materials with the giant Rashba effect. The main nontrivial feature of the PSOI is that it is attractive for electrons in certain spin configurations tied to their momentum and competes with the Coulomb repulsion of the electrons. Under certain conditions attainable in modern low-dimensional structures the PSOI prevails. The resulting attraction between electrons leads to the formation of bound electron pairs, the binding energy of which can be controlled by electrical means. In many-electron systems the PSOI results in the instabilities of the uniform ground state with respect to the density fluctuations, which develop on different spatial scales, depending on the geometry of the electric fields that produce the PSOI. If the PSOI is not too strong the electronic system is stable, but its collective excitations reveal the highly unusual spin-charge structure and spectrum, which manifest themselves in the frequency dependence of the dynamic conductivity.
