Majorana Zero Modes in Graphene

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Título: Majorana Zero Modes in Graphene
Autor/es: San-Jose, P. | Lado, Jose L. | Aguado Sola, Ramón | Guinea, F. | Fernández-Rossier, Joaquín
Grupo/s de investigación o GITE: Grupo de Nanofísica
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Física Aplicada | Universidad de Alicante. Instituto Universitario de Materiales
Palabras clave: Graphene | Superconductivity | Topological insulators | Majorana zero modes
Área/s de conocimiento: Física de la Materia Condensada
Fecha de publicación: 15-dic-2015
Editor: American Physical Society
Cita bibliográfica: Physical Review X. 2015, 5: 041042. doi:10.1103/PhysRevX.5.041042
Resumen: A clear demonstration of topological superconductivity (TS) and Majorana zero modes remains one of the major pending goals in the field of topological materials. One common strategy to generate TS is through the coupling of an s-wave superconductor to a helical half-metallic system. Numerous proposals for the latter have been put forward in the literature, most of them based on semiconductors or topological insulators with strong spin-orbit coupling. Here, we demonstrate an alternative approach for the creation of TS in graphene-superconductor junctions without the need for spin-orbit coupling. Our prediction stems from the helicity of graphene’s zero-Landau-level edge states in the presence of interactions and from the possibility, experimentally demonstrated, of tuning their magnetic properties with in-plane magnetic fields. We show how canted antiferromagnetic ordering in the graphene bulk close to neutrality induces TS along the junction and gives rise to isolated, topologically protected Majorana bound states at either end. We also discuss possible strategies to detect their presence in graphene Josephson junctions through Fraunhofer pattern anomalies and Andreev spectroscopy. The latter, in particular, exhibits strong unambiguous signatures of the presence of the Majorana states in the form of universal zero-bias anomalies. Remarkable progress has recently been reported in the fabrication of the proposed type of junctions, which offers a promising outlook for Majorana physics in graphene systems.
Patrocinador/es: We acknowledge the support of the European Research Council (F. G.), the Spanish Ministry of Economy and Innovation through Grants No. FIS2011-23713 (F. G. and P. S.-J.) and No. FIS2012-33521 (R. A.), the Ramón y Cajal Programme (P. S.-J.), the Marie-Curie-ITN 607904-SPINOGRAPH (J. L., J. F. R., and F. G.), and Generalitat Valenciana (ACOMP/2010/070), Prometeo (J. F. R.).
URI: http://hdl.handle.net/10045/54254
ISSN: 2160-3308
DOI: 10.1103/PhysRevX.5.041042
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Revisión científica: si
Versión del editor: http://dx.doi.org/10.1103/PhysRevX.5.041042
Aparece en las colecciones:Investigaciones financiadas por la UE
INV - Grupo de Nanofísica - Artículos de Revistas

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