Quantum phase transition triggering magnetic bound states in the continuum in graphene

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dc.contributor.authorGuessi, L. H. [UNESP]
dc.contributor.authorMarques, Y. [UNESP]
dc.contributor.authorMachado, R. S. [UNESP]
dc.contributor.authorKristinsson, K.
dc.contributor.authorRicco, L. S. [UNESP]
dc.contributor.authorShelykh, I. A.
dc.contributor.authorFigueira, M. S.
dc.contributor.authorDe Souza, M. [UNESP]
dc.contributor.authorSeridonio, A. C. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionNanyang Technological University
dc.contributor.institutionUniversity of Iceland
dc.contributor.institutionITMO University
dc.contributor.institutionUniversidade Federal Fluminense (UFF)
dc.contributor.institutionJohannes Kepler University Linz
dc.date.accessioned2018-12-11T16:59:55Z
dc.date.available2018-12-11T16:59:55Z
dc.date.issued2015-12-07
dc.description.abstractGraphene hosting a pair of collinear adatoms in the phantom atom configuration has density of states vanishing in the vicinity of the Dirac point which can be described in terms of the pseudogap scaling as cube of the energy, Δ∞|ε|3, which leads to the appearance of spin-degenerate bound states in the continuum (BICs) [Phys. Rev. B 92, 045409 (2015)PRBMDO1098-012110.1103/PhysRevB.92.045409]. In the case when adatoms are locally coupled to a single carbon atom the pseudogap scales linearly with energy, which prevents the formation of BICs. Here, we explore the effects of nonlocal coupling characterized by the Fano factor of interference q0, tunable by changing the slope of the Dirac cones in the graphene band structure. We demonstrate that three distinct regimes can be identified: (i) for q0<qc1 (critical point) a mixed pseudogap Δ∞|ε|,|ε|2 appears yielding a phase with spin-degenerate BICs; (ii) near q0=qc1 when Δ∞|ε|2 the system undergoes a quantum phase transition (QPT) in which the new phase is characterized by magnetic BICs, and (iii) at a second critical value q0>qc2 the cubic scaling of the pseudogap with energy Δ∞|ε|3 characteristic to the phantom atom configuration is restored and the phase with nonmagnetic BICs is recovered. The phase with magnetic BICs can be described in terms of an effective intrinsic exchange field of ferromagnetic nature between the adatoms mediated by graphene monolayer. We thus propose a new type of QPT resulting from the competition between two ground states, respectively characterized by spin-degenerate and magnetic BICs.en
dc.description.affiliationIGCE Unesp-Univ Estadual Paulista Departamento de Física
dc.description.affiliationDepartamento de Física e Química Unesp-Univ Estadual Paulista
dc.description.affiliationDivision of Physics and Applied Physics Nanyang Technological University
dc.description.affiliationScience Institute University of Iceland, Dunhagi-3
dc.description.affiliationITMO University
dc.description.affiliationInstituto de Física Universidade Federal Fluminense
dc.description.affiliationInstitute of Semiconductor and Solid State Physics Johannes Kepler University Linz
dc.description.affiliationUnespIGCE Unesp-Univ Estadual Paulista Departamento de Física
dc.description.affiliationUnespDepartamento de Física e Química Unesp-Univ Estadual Paulista
dc.identifierhttp://dx.doi.org/10.1103/PhysRevB.92.245107
dc.identifier.citationPhysical Review B - Condensed Matter and Materials Physics, v. 92, n. 24, 2015.
dc.identifier.doi10.1103/PhysRevB.92.245107
dc.identifier.file2-s2.0-84952311498.pdf
dc.identifier.issn1550-235X
dc.identifier.issn1098-0121
dc.identifier.scopus2-s2.0-84952311498
dc.identifier.urihttp://hdl.handle.net/11449/172363
dc.language.isoeng
dc.relation.ispartofPhysical Review B - Condensed Matter and Materials Physics
dc.relation.ispartofsjr1,604
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.titleQuantum phase transition triggering magnetic bound states in the continuum in grapheneen
dc.typeArtigo
unesp.author.lattes4319898277403494[9]
unesp.author.orcid0000-0001-5612-9485[9]

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