A Green's function approach to topological insulator junctions with magnetic and superconducting regions

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dc.contributor.authorCasas, Oscar E.
dc.contributor.authorGómez Páez, Shirley
dc.contributor.authorHerrera, William J.
dc.date.accessioned2020-10-28T16:58:22Z
dc.date.available2020-10-28T16:58:22Z
dc.description.abstractenglishThis work presents a Green’s function approach, originally implemented in graphene with well-defined edges, to the surface of a strong 3D Topological Insulator (TI) with a sequence of proximitizedsuperconducting (S) and ferromagnetic (F) surfaces. This consists of the derivation of the Green’sfunctions for each region by the asymptotic solutions method, and their coupling by a tight-bindingHamiltonian with the Dyson equation to obtain the full Green’s functions of the system. Thesefunctions allow the direct calculation of the momentum-resolved spectral density of states, the iden-tification of subgap interface states, and the derivation of the differential conductance for a widevariety of configurations of the junctions. We illustrate the application of this method for somesimple systems with two and three regions, finding the characteristic chiral state of the QuantumAnomalous Hall Effect (QAHE) at the NF interfaces, and chiral Majorana modes at the NS inter-faces. Finally, we discuss some geometrical effects present in three-region junctions such as weakFabry-P ́erot resonances and Andreev bound states.eng
dc.format.mimetypeapplication/pdf
dc.identifier.doihttps://arxiv.org/ct?url=https%3A%2F%2Fdx.doi.org%2F10.1088%2F1361-648X%2Fabafc9&v=fd09ea67
dc.identifier.instnameinstname:Universidad El Bosquespa
dc.identifier.issn1361-648X
dc.identifier.reponamereponame:Repositorio Institucional Universidad El Bosquespa
dc.identifier.repourlrepourl:https://repositorio.unbosque.edu.co
dc.identifier.urihttps://hdl.handle.net/20.500.12495/4592
dc.language.isoeng
dc.publisherInstitute of Physics Publishingspa
dc.publisher.journalJournal of physics condensed matterspa
dc.relation.ispartofseriesJournal of physics condensed matter, 1361-648X, Vol. 32, Nro. 18, 2020spa
dc.relation.urihttps://iopscience.iop.org/article/10.1088/1361-648X/abafc9
dc.rights.accessrightshttps://purl.org/coar/access_right/c_abf2
dc.rights.accessrightsinfo:eu-repo/semantics/openAccess
dc.rights.accessrightsAcceso abierto
dc.rights.creativecommons2020-09-01
dc.rights.localAcceso abiertospa
dc.subject.keywordsAndreev reflectionsspa
dc.subject.keywordsGreen functionsspa
dc.subject.keywordsMagnetic-superconducting junctionsspa
dc.subject.keywordsMajorana statesspa
dc.subject.keywordsTopological insulatorsspa
dc.titleA Green's function approach to topological insulator junctions with magnetic and superconducting regionsspa
dc.title.translatedA Green's function approach to topological insulator junctions with magnetic and superconducting regionsspa
dc.type.coarhttps://purl.org/coar/resource_type/c_6501
dc.type.driverinfo:eu-repo/semantics/article
dc.type.hasversioninfo:eu-repo/semantics/publishedVersion
dc.type.localArtículo de revista

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