Coexisting Edge States and Gapless Bulk in Topological States of Matter

被引：38

作者：

Baum, Yuval ^{[1
]}

Posske, Thore ^{[2
]}

Fulga, Ion Cosma ^{[1
]}

Trauzettel, Bjoern ^{[2
]}

Stern, Ady ^{[1
]}

机构：

[1] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-76100 Rehovot, Israel

[2] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 13期

基金：

欧洲研究理事会;

关键词：

HGTE QUANTUM-WELLS; INSULATORS; SUPERCONDUCTORS; REALIZATION;

D O I：

10.1103/PhysRevLett.114.136801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We consider two-dimensional systems in which edge states coexist with a gapless bulk. Such systems may be constructed, for example, by coupling a gapped two-dimensional state of matter that carries edge states to a gapless two-dimensional system in which the spectrum is composed of a number of Dirac cones. We find that, in the absence of disorder, the edge states could be protected even when the two systems are coupled, due to momentum and energy conservation. We distinguish between weak and strong edge states by the level of their mixing with the bulk. In the presence of disorder, the edge states may be stabilized when the bulk is localized or destabilized when the bulk is metallic. We analyze the conditions under which these two cases occur. Finally, we propose a concrete physical realization for one of our models based on bilayer Hg(Cd)Te quantum wells.

引用

页数：5

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