Multiple Quantum Phases in Graphene with Enhanced Spin-Orbit Coupling: From the Quantum Spin Hall Regime to the Spin Hall Effect and a Robust Metallic State

被引：37

作者：

Cresti, Alessandro ^{[1
,2
]}

Dinh Van Tuan ^{[3
,4
]}

Soriano, David ^{[3
]}

Cummings, Aron W. ^{[3
]}

Roche, Stephan ^{[3
,5
]}

机构：

[1] Univ Grenoble Alpes, IMEP LAHC, F-38000 Grenoble, France

[2] CNRS, IMEP LAHC, F-38000 Grenoble, France

[3] ICN2 Inst Catala Nanociencia & Nanotecnol, Bellaterra 08193, Barcelona, Spain

[4] Univ Autonoma Barcelona, Dept Phys, Bellaterra 08193, Spain

[5] Inst Catalana Recerca & Estudis Avancats, Barcelona 08010, Spain

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 113卷 / 24期

关键词：

DISORDERED GRAPHENE; TOPOLOGICAL INSULATORS; TRANSPORT;

D O I：

10.1103/PhysRevLett.113.246603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report an intriguing transition from the quantum spin Hall phase to the spin Hall effect upon segregation of thallium adatoms adsorbed onto a graphene surface. Landauer-Buttiker and Kubo-Greenwood simulations are used to access both edge and bulk transport physics in disordered thallium-functionalized graphene systems of realistic sizes. Our findings not only quantify the detrimental effects of adatom clustering in the formation of the topological state, but also provide evidence for the emergence of spin accumulation at opposite sample edges driven by spin-dependent scattering induced by thallium islands, which eventually results in a minimum bulk conductivity similar to 4e(2)/h, insensitive to localization effects.

引用

页数：5

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