SNS junctions in nanowires with spin-orbit coupling: Role of confinement and helicity on the subgap spectrum

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Show simple item record Cayao, Jorge Prada, Elsa San-Jose, Pablo Aguado, Ramón
dc.contributor.other UAM. Departamento de Física de la Materia Condensada es_ES 2016-09-06T10:23:59Z 2016-09-06T10:23:59Z 2015-01-29
dc.identifier.citation Physical Review B - Condensed Matter and Materials Physics 91.2 (2015): 024514 en_US
dc.identifier.issn 1098-0121 (print) es_ES
dc.identifier.issn 1550-235X (online) es_ES
dc.description.abstract We study normal transport and the subgap spectrum of superconductor-normal-superconductor (SNS) junctions made of semiconducting nanowires with strong Rashba spin-orbit coupling. We focus, in particular, on the role of confinement effects in long ballistic junctions. In the normal regime, scattering at the two contacts gives rise to two distinct features in conductance: Fabry-Perot resonances and Fano dips. The latter arise in the presence of a strong Zeeman field B that removes a spin sector in the leads (helical leads), but not in the central region. Conversely, a helical central region between nonhelical leads exhibits helical gaps of half-quantum conductance, with superimposed helical Fabry-Perot oscillations. These normal features translate into distinct subgap states when the leads become superconducting. In particular, Fabry-Perot resonances within the helical gap become parity-protected zero-energy states (parity crossings), well belowthe critical field Bc at which the superconducting leads become topological. As a function of Zeeman field or Fermi energy, these zero modes oscillate around zero energy, forming characteristic loops, which evolve continuously into Majorana bound states as B exceeds Bc. The relation with the physics of parity crossings of Yu-Shiba-Rusinov bound states is discussed en_US
dc.description.sponsorship We acknowledge the support of the European Research Council and the Spanish Ministry of Economy and Innovation through the JAE-Predoc Program, (J.C.) Grants No. FIS2011-23713 (P.S.-J), No. FIS2012-33521 (R.A.), No. FIS2013-47328 (E.P.), and the Ramón y Cajal Program (E.P) en_US
dc.format.extent 15 pag. en
dc.format.mimetype application/pdf en
dc.language.iso eng en
dc.publisher American Physical Society en_US
dc.relation.ispartof Physical Review B - Condensed Matter and Materials Physics en_US
dc.rights ©2015 American Physical Society en_US
dc.subject.other SNS en_US
dc.subject.other Semiconducting nanowires en_US
dc.subject.other Ballistic junctions en_US
dc.subject.other Distinct subgap en_US
dc.title SNS junctions in nanowires with spin-orbit coupling: Role of confinement and helicity on the subgap spectrum en_US
dc.type article en
dc.subject.eciencia Física es_ES
dc.relation.publisherversion es_ES
dc.identifier.doi 10.1103/PhysRevB.91.024514 es_ES
dc.identifier.publicationfirstpage 024514-1 es_ES
dc.identifier.publicationissue 2 es_ES
dc.identifier.publicationlastpage 024514-15 es_ES
dc.identifier.publicationvolume 91 es_ES
dc.relation.projectID Gobierno de España. FIS2011- 23713 es_ES
dc.relation.projectID Gobierno de España. FIS2012-33521 es_ES
dc.relation.projectID Gobierno de España. FIS2013- 47328 es_ES
dc.type.version info:eu-repo/semantics/publishedVersion en
dc.rights.accessRights openAccess en

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