Latyshev Yu I, Orlov A P, Volkov V A, Enaldiev V V, Zagorodnev I V, Vyvenko O F, Petrov Yu V, Monceau P
Kotelnikov Institute of Radio-engineering and Electronics of RAS, Mokhovaya 11-7, 125009 Moscow, Russia.
1] Kotelnikov Institute of Radio-engineering and Electronics of RAS, Mokhovaya 11-7, 125009 Moscow, Russia [2] Moscow Institute of Physics and Technology, Institutskii per. 9, Dolgoprudny, 141700 Moscow region, Russia.
Sci Rep. 2014 Dec 19;4:7578. doi: 10.1038/srep07578.
There are two types of intrinsic surface states in solids. The first type is formed on the surface of topological insulators. Recently, transport of massless Dirac fermions in the band of "topological" states has been demonstrated. States of the second type were predicted by Tamm and Shockley long ago. They do not have a topological background and are therefore strongly dependent on the properties of the surface. We study the problem of the conductivity of Tamm-Shockley edge states through direct transport experiments. Aharonov-Bohm magneto-oscillations of resistance are found on graphene samples that contain a single nanohole. The effect is explained by the conductivity of the massless Dirac fermions in the edge states cycling around the nanohole. The results demonstrate the deep connection between topological and non-topological edge states in 2D systems of massless Dirac fermions.
固体中有两种本征表面态。第一种类型形成于拓扑绝缘体的表面。最近，已证明在“拓扑”态能带中无质量狄拉克费米子的输运。第二种类型的态是很久以前由塔姆和肖克利预测的。它们没有拓扑背景，因此强烈依赖于表面的性质。我们通过直接输运实验研究塔姆 - 肖克利边缘态的电导率问题。在含有单个纳米孔的石墨烯样品上发现了电阻的阿哈罗诺夫 - 玻姆磁振荡。这种效应可以用围绕纳米孔循环的边缘态中无质量狄拉克费米子的电导率来解释。结果表明在无质量狄拉克费米子的二维系统中拓扑和非拓扑边缘态之间存在深刻的联系。
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