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arXiv 0910.0756cond-mat.mes-hall
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二维螺旋液体中的准粒子散射

Quasiparticle scattering in two dimensional helical liquid

Xiaoting Zhou, Chen Fang, Wei-Feng Tsai, Jiangping Hu

摘要:

研究了二维螺旋液体中磁杂质、磁点杂质和边缘杂质散射引起的准粒子干涉(QPI)图样,该图样描述了拓扑绝缘体的表面态.与六角形翘曲效应相关联的独特功能被确定在QPI图案的电荷密度与磁性杂质和自旋密度与磁性杂质。QPI模式的对称性可以用来确定微观模型的对称性。计算了边缘杂质的Friedel振荡,发现该振荡的衰减并不普遍,而是强烈地依赖于费米能。我们的理论结果和目前的实验观测之间的一些差异进行了讨论。

英文摘要:

We study the quasiparticle interference (QPI) patterns caused by scattering off nonmagnetic, magnetic point impurities, and edge impurities, separately, in a two dimensional helical liquid, which describes the surface states of a topological insulator. The unique features associated with hexagonal warping effects are identified in the QPI patterns of charge density with nonmagnetic impurities and spin density with magnetic impurities. The symmetry properties of the QPI patterns can be used to determine the symmetry of microscopic models. The Friedel oscillation is calculated for edge impurities and the decay of the oscillation is not universal, strongly depending on Fermi energy. Some discrepancies between our theoretical results and current experimental observations are discussed.

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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