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arXiv 1306.3125cond-mat.mes-hall
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利用磁化强度定量测定Rashba和Dresselhaus自旋轨道相互作用的另一种方法

Alternative method for the quantitative determination of Rashba- and Dresselhaus spin-orbit interaction using the magnetization

Marc A. Wilde, Dirk Grundler

摘要:

在磁场B中的二维电子系统的量子振荡磁化强度M被发现提供了Rashba和Dresselhaus自旋轨道相互作用(SOI)的定量信息。这是通过首先数值求解包括线性Rashba-和Dresselhaus SOI以及特别是双倾斜磁场中的塞曼项的模型哈密顿量,然后评估平面内磁场分量的不同方向的固有各向异性磁化来示出的。M(B)中特定磁量子振荡的幅度被发现是SOI强度的直接度量,在B场处SOI诱导的朗道能级反交叉发生。各向异性M允许人们量化两个贡献的大小以及它们的相对符号。我们使用现实的样品参数,并表明,最近报道的实验技术提供了一个灵敏度,允许检测的预测现象。

英文摘要:

The quantum oscillatory magnetization M of a two-dimensional electron system in a magnetic field B is found to provide quantitative information on both the Rashba- and Dresselhaus spin-orbit interaction (SOI). This is shown by first numerically solving the model Hamiltonian including the linear Rashba- and Dresselhaus SOI and the Zeeman term in an in particular doubly tilted magnetic field and second evaluating the intrinsically anisotropic magnetization for different directions of the in-plane magnetic field component. The amplitude of specific magnetic quantum oscillations in M(B) is found to be a direct measure of the SOI strength at fields B where SOI-induced Landau level anticrossings occur. The anisotropic M allows one to quantify the magnitude of both contributions as well as their relative sign. We use realistic sample parameters and show that recently reported experimental techniques provide a sensitivity which allows for the detection of the predicted phenomena.

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