Charge transport and shot noise on the surface of a topological insulator with a magnetic modulation

被引：7

作者：

Yuan Jian-Hui ^{[1
]}

Cheng Ze ^{[1
]}

Zhang Jian-Jun ^{[1
]}

Zeng Qi-Jun ^{[1
]}

Zhang Jun-Pei ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China

来源：

CHINESE PHYSICS B | 2012年 / 21卷 / 04期

基金：

中国国家自然科学基金;

关键词：

topological insulator; electronic transport; ferrimagnetic; HGTE QUANTUM-WELLS; STATES; PHASE;

D O I：

10.1088/1674-1056/21/4/047203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this paper, we investigate the transport features and the Fano factor of Dirac electrons on the surface of a three-dimensional topological insulator with a magnetic modulation. We consider a hard wall bounding condition on the edge of the topological insulator, which implies that a surface state of the topological insulator is insulating. We find that a valley of conductivity at the Dirac point is associated with a Fano factor peak, and more interestingly, this topological metal changes from insulating to metallic by controlling the effective exchange field.

引用

页数：6

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