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arXiv 1602.01653cond-mat.mes-hall
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扫描门显微镜测量自旋轨道耦合

Spin-orbit coupling measurement by the scanning gate microscopy

K. Kolasiński, H. Sellier, B. Szafran

摘要:

我们提出了一个从电导显微镜中提取具有强Rashba自旋轨道耦合的二维电子气费米面的方法。由于有效的自旋轨道磁场和外部的平面内的限制,由位于样品上方的原子力显微镜的带电尖端引起的反向散射之间的相互作用,导致自旋进动,从而入射和反射模式的自旋混合。这种混合导致电导图中可见的特征性角度依赖性拍频模式。我们表明,费米能级的结构,轴承签名的自旋-轨道耦合,可以提取从傅立叶变换的干涉条纹的电导图作为磁场方向的函数。我们提出了一个简单的分析模型,可以用来拟合实验数据,以获得自旋轨道耦合常数。

英文摘要:

We propose a procedure for extraction of the Fermi surface for a two-dimensional electron gas with a strong Rashba spin-orbit coupling from conductance microscopy. Due to the interplay between the effective spin-orbit magnetic field and the external one within the plane of confinement, the backscattering induced by a charged tip of an atomic force microscope located above the sample, leads to the spin precession, and thus to the spin mixing of the incident and reflected modes. This mixing leads to a characteristic angle-dependent beating pattern visible in the conductance maps. We show that the structure of the Fermi level, bearing signatures of the spin-orbit coupling, can be extracted from the Fourier transform of the interference fringes in the conductance maps as a function of the magnetic field direction. We propose a simple analytical model which can be used to fit the experimental data in order to obtain the spin-orbit coupling constant.

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