arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.3280cond-mat.mes-hall
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拓扑绝缘体中的量子干涉和Aharonov-Bohm振荡

Quantum interference and Aharonov-Bohm oscillations in topological insulators

Jens H. Bardarson, Joel E. Moore

摘要:

拓扑绝缘体具有绝缘本体但具有金属表面。在最简单的情况下,3D拓扑绝缘体的表面电子结构由单个2D狄拉克锥描述。一个单一的二维狄拉克费米子不能在一个孤立的具有时间反演对称性的二维系统中实现,而是将其存在归功于三维体波函数的拓扑性质。这种表面态的输运性质是当前相当感兴趣的;它们与石墨烯有一些相似之处,石墨烯也实现了狄拉克费米子,但在它们对磁场的响应中有几个独特的特征。本文综述了拓扑绝缘体表面的一些主要量子输运性质。我们专注于努力使用量子干涉现象,如弱反局域化和Aharonov-Bohm效应,在传输实验中验证表面态的狄拉克性质及其定义属性。除了解释理论的基本思想和预测外,我们还提供了最近实验工作的调查。

英文摘要:

Topological insulators have an insulating bulk but a metallic surface. In the simplest case, the surface electronic structure of a 3D topological insulator is described by a single 2D Dirac cone. A single 2D Dirac fermion cannot be realized in an isolated 2D system with time-reversal symmetry, but rather owes its existence to the topological properties of the 3D bulk wavefunctions. The transport properties of such a surface state are of considerable current interest; they have some similarities with graphene, which also realizes Dirac fermions, but have several unique features in their response to magnetic fields. In this review we give an overview of some of the main quantum transport properties of topological insulator surfaces. We focus on the efforts to use quantum interference phenomena, such as weak anti-localization and the Aharonov-Bohm effect, to verify in a transport experiment the Dirac nature of the surface state and its defining properties. In addition to explaining the basic ideas and predictions of the theory, we provide a survey of recent experimental work.

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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