4.8 Article

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

期刊

PHYSICAL REVIEW LETTERS
卷 113, 期 24, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.113.246603

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资金

  1. Spanish Ministry of Economy and Competitiveness [MAT2012-33911]
  2. Severo Ochoa Program (MINECO) [SEV-2013-0295]
  3. Secretaria de Universidades e Investigacion del Departamento de Economia y Conocimiento de la Generalidad de Cataluna
  4. European Union Seventh Framework Programme [604391]
  5. ICREA Funding Source: Custom

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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.

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