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arXiv 1206.4537cond-mat.mes-hallquant-ph
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各向异性三角晶格上的自旋霍尔电导

Spin Hall Conductivity on the Anisotropic Triangular Lattice

Paul Wenk, Stefan Kettemann, Georges Bouzerar

摘要:

本文详细研究了Rashba自旋轨道耦合作用下二维三角晶格的自旋霍尔电导率。特别是,我们集中我们的注意力的最近邻跳跃振幅的各向异性的效果的一部分。据发现,各向异性的存在下,自旋霍尔电导率有显着的影响,特别是在空穴掺杂制度,其中一个显着的增加或/和反转的自旋霍尔电导率的符号已经获得。我们还提供了一个系统的分析贝里相位的数值结果。在特定的载流子密度下观察到的符号的变化似乎是费米表面拓扑结构和电子速度符号变化的结果。此外,与二维正方晶格相比,本文指出,在三角晶格上,紧束缚自旋轨道哈密顿量应该从连续模型中仔细推导。

英文摘要:

We present a detailed study of the spin Hall conductivity on a two-dimensional triangular lattice in the presence of Rashba spin-orbit coupling. In particular, we focus part of our attention on the effect of the anisotropy of the nearest neighbor hopping amplitude. It is found that the presence of anisotropy has drastic effects on the spin Hall conductivity, especially in the hole doped regime where a significant increase or/and reversed sign of the spin Hall conductivity has been obtained. We also provide a systematic analysis of the numerical results in terms of Berry phases. The changes of signs observed at particular density of carriers appear to be a consequence of both Fermi surface topology and change of sign of electron velocity. In addition, in contrast to the two-dimensional square lattice, it is shown that the tight binding spin-orbit Hamiltonian should be derived carefully from the continuous model on the triangular lattice.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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