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arXiv 0801.4588cond-mat.mes-hallcond-mat.str-el
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具有一般自旋耦合的自旋手征铁磁kagome晶格的边缘态和整数量子霍尔效应

Edge states and the integer quantum Hall effect of spin-chiral ferromagnetic kagome lattice with a general spin coupling

Zhigang Wang, Ping Zhang

摘要:

研究了一般Hund耦合区域内具有自旋各向异性的二维kagomé晶格中的手征边缘态和量子化霍尔电导(QHC)。该kagomé晶格系统在$x$方向上是周期性的,但是在$y$方向上具有两个边。数值计算结果表明,Hund耦合的强度,以及自旋手征,影响的边缘状态和相应的QHC。利用拓扑边理论,我们给出了Riemman曲面上手征边态的缠绕数与QHC的关系。并将该表达式与拓扑体理论中的表达式进行了比较,发现它们是一致的。

英文摘要:

The chiral edge states and the quantized Hall conductance (QHC) in the two-dimensional kagomé lattice with spin anisotropies included in a general Hund's coupling region are studied. This kagomé lattice system is periodic in the $x$ direction but has two edges in the $y$ direction. Numerical results show that the strength of the Hund's coupling, as well as the spin chirality, affects the edge states and the corresponding QHC. Within the topological edge theory, we give the expression of the QHC with the winding number of the chiral edge states on the Riemman surface. This expression is also compaired with that within the topological bulk theory and they are found to keep consistent with each other.

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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