Unveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switch

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dc.contributor.authorDessotti, F. A. [UNESP]
dc.contributor.authorRicco, L. S. [UNESP]
dc.contributor.authorMarques, Y. [UNESP]
dc.contributor.authorGuessi, L. H. [UNESP]
dc.contributor.authorYoshida, M. [UNESP]
dc.contributor.authorFigueira, M. S.
dc.contributor.authorDe Souza, M. [UNESP]
dc.contributor.authorSodano, Pasquale
dc.contributor.authorSeridonio, A. C. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Federal Fluminense (UFF)
dc.contributor.institutionUniversidade Federal Do Rio Grande Do Norte
dc.date.accessioned2018-12-11T17:06:47Z
dc.date.available2018-12-11T17:06:47Z
dc.date.issued2016-09-16
dc.description.abstractWe propose a theoretical approach based on an interferometer composed by two quantum dots asymmetrically coupled to isolated Majorana quasiparticles (MQPs), lying on the edges of two topological Kitaev chains, respectively, via couplings (t+Δ) and (Δ-t). This setup enables us to probe MQPs in a quite distinct way from the zero-bias peak feature. Most importantly, the system behaves as a current switch made by two distinct paths: (i) for the upper dot connected to both chains, the device perceives both MQPs as an ordinary fermion and the current crosses solely the lower dot, since current in the upper dot is prevented due to the presence of the superconducting gap; and (ii) by suppressing slightly the hybridization of the upper dot with one chain, the current is abruptly switched to flow through this dot, once a trapped electron as a bound state in the continuum (BIC) [Phys. Rev. B 93, 165116 (2016)2469-995010.1103/PhysRevB.93.165116] appears in the lower dot. Such a current switch between upper and lower dots characterizes the quantum phase transition (QPT) proposed here, being the ratio t/Δ the control parameter of the transition. This QPT is associated with a change from an ordinary fermionic excitation regime to a MQP in the interferometer, which enables not only the fundamental revealing of MQPs, but also yields a current switch assisted by them.en
dc.description.affiliationDepartamento de Física e Química Unesp - Univ Estadual Paulista
dc.description.affiliationIGCE Unesp - Univ Estadual Paulista Departamento de Física
dc.description.affiliationInstituto de Física de São Carlos Universidade de São Paulo, C.P. 369
dc.description.affiliationInstituto de Física Universidade Federal Fluminense
dc.description.affiliationInternational Institute of Physics Universidade Federal Do Rio Grande Do Norte
dc.description.affiliationDepartamento de Física Teórica e Experimental Universidade Federal Do Rio Grande Do Norte
dc.description.affiliationUnespDepartamento de Física e Química Unesp - Univ Estadual Paulista
dc.description.affiliationUnespIGCE Unesp - Univ Estadual Paulista Departamento de Física
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.identifierhttp://dx.doi.org/10.1103/PhysRevB.94.125426
dc.identifier.citationPhysical Review B, v. 94, n. 12, 2016.
dc.identifier.doi10.1103/PhysRevB.94.125426
dc.identifier.file2-s2.0-84991243800.pdf
dc.identifier.issn2469-9969
dc.identifier.issn2469-9950
dc.identifier.scopus2-s2.0-84991243800
dc.identifier.urihttp://hdl.handle.net/11449/173609
dc.language.isoeng
dc.relation.ispartofPhysical Review B
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.titleUnveiling Majorana quasiparticles by a quantum phase transition: Proposal of a current switchen
dc.typeArtigo
unesp.author.lattes4319898277403494[9]
unesp.author.orcid0000-0001-5612-9485[9]

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