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dc.contributor.authorKul, E.B.
dc.contributor.authorPolat, Mehmet
dc.contributor.authorGüçlü, A.D.
dc.date.accessioned2021-02-12T18:45:37Z
dc.date.available2021-02-12T18:45:37Z
dc.date.issued2020
dc.identifier.issn0038-1098
dc.identifier.urihttps://doi.org/10.1016/j.ssc.2020.114096
dc.identifier.urihttps://hdl.handle.net/11147/9865
dc.description.abstractElectronic and magnetic properties of a system of two charged vacancies in hexagonal shaped graphene quantum dots are investigated using a mean-field Hubbard model as a function of the Coulomb potential strength ? of the charge impurities and the distance R between them. For ?=0, the magnetic properties of the vacancies are dictated by Lieb's rules where the opposite (same) sublattice vacancies are coupled antiferromagnetically (ferromagnetically) and exhibit Fermi oscillations. Here, we demonstrate the emergence of a non-magnetic regime within the subcritical region: as the Coulomb potential strength is increased to ??0.1, before reaching the frustrated atomic collapse regime, the magnetization is strongly suppressed and the ground state total spin projection is given by Sz=0 both for opposite and same sublattice vacancy configurations. When long-range electron–electron interactions are included within extended mean-field Hubbard model, the critical value for the frustrated collapse increases from ?cf?0.28 to ?cf?0.36 for R<27Å. © 2020 Elsevier Ltden_US
dc.description.sponsorship116F152en_US
dc.description.sponsorshipThis research was supported by the Scientific and Technological Research Council of Turkey TÜBİTAK under the 1001 grant project number 116F152 , Turkey.en_US
dc.language.isoengen_US
dc.publisherElsevier Ltden_US
dc.relation.isversionof10.1016/j.ssc.2020.114096en_US
dc.rightsinfo:eu-repo/semantics/closedAccessen_US
dc.subjectAtomic collapseen_US
dc.subjectGraphene nanostructuresen_US
dc.subjectMagnetizationen_US
dc.subjectVacancyen_US
dc.titleElectronic and magnetic properties of graphene quantum dots with two charged vacanciesen_US
dc.typearticleen_US
dc.typearticleen_US
dc.relation.journalSolid State Communicationsen_US
dc.contributor.departmentIzmir Isntitute of Technologyen_US
dc.identifier.volume322en_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanıen_US


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