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arXiv 0907.0110cond-mat.mes-hall
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反常霍尔效应的Landauer-Büttiker研究

Landauer-Büttiker Study of the Anomalous Hall Effect

Maria Silvia Garelli, John Schliemann

摘要:

我们报告了Landauer-Büttiker对具有Rashba自旋轨道耦合和局域磁矩提供的磁化的二维电子气中的反常霍尔输运的研究。我们的系统由四端几何中的离散紧束缚模型描述。我们考虑了磁无序系统的情况以及空间均匀磁化的无无序系统中的弹道输运。在后一种情况下,我们调查面外和面内磁化。我们在数值上建立了一个紧密的联系,在接近较低的带边的霍尔电导的态密度和峰值的奇异性。与以前的理论研究的基础上图形微扰展开,这些峰发生在费米能量,只有较低的色散分支被占用。此外,对于大的磁化霍尔电导,随着态密度,被抑制。这个数值结果可以从无限系统极限下的基本模型的分析性质中理解。

英文摘要:

We report on Landauer-Büttiker studies of anomalous Hall transport in a two-dimensional electron gas with Rashba spin-orbit coupling and a magnetization provided by localized magnetic moments. Our system is described by a discretized tight-binding model in a four-terminal geometry. We consider both the case of magnetically disordered systems as well as ballistic transport in disorder-free systems with spatially homoge- neous magnetization. In the latter case we investigate both out-of-plane and in-plane magnetizations. We numerically establish a close connection between singularities in the density of states and peaks in the Hall conductance close to the lower band edge. Consistent with previous theoretical studies based on diagrammatic perturbation expansions, these peaks occur at Fermi energies where only the lower dispersion branch is occupied. Moreover, for large magnetization the Hall conductance is, along with the density of states, sup- pressed. This numerical finding can be understood from analytical properties of the underlying model in the limit of an infinite system.

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