Helical bound states in the continuum of the edge states in two dimensional topological insulators

被引：19

作者：

Sablikov, Vladimir A. ^{[1
]}

Sukhanov, Aleksei A. ^{[1
]}

机构：

[1] Russian Acad Sci, VA Kotelnikov Inst Radio Engn & Elect, Fiyazino 141190, Moscow District, Russia

来源：

PHYSICS LETTERS A | 2015年 / 379卷 / 30-31期

基金：

俄罗斯基础研究基金会;

关键词：

Bound states in continuum; Topological insulator; Defects; Helical edge states; RESONANCES;

D O I：

10.1016/j.physleta.2015.05.005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study bound states embedded into the continuum of edge states in two-dimensional topological insulators. These states emerge in the presence of a short-range potential of a structural defect coupled to the boundary. In this case the edge states flow around the defect and have two resonances in the local density of states. The bound state in continuum (BIC) arises due to an interference of the resonances when they are close to the degeneracy. We find the condition under which the BIC appears, study the spacial distribution of the electron density, and show that the BIC has a helical structure with an electron current circulating around the defect. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：1775 / 1779

页数：5

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