Dynamical mean-field theory for spin-dependent electron transport in spin-valve devices

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dc.citation.issue7
dc.citation.rankM21
dc.citation.spage075156
dc.citation.volume106
dc.contributor.authorDroghetti, Andrea
dc.contributor.authorRadonjić, Miloš M.
dc.contributor.authorChioncel, Liviu
dc.contributor.authorRungger, Ivan
dc.date.accessioned2023-05-16T11:58:05Z
dc.date.available2023-05-16T11:58:05Z
dc.date.issued2022-08-15
dc.description.abstractWe present a combination of density functional theory and dynamical mean-field theory (DMFT) for comput-ing the electron transmission through two-terminal nanoscale devices. The method is then applied to metallic junctions presenting alternating Cu and Co layers, which exhibit spin-dependent charge transport and the giant magnetoresistance (GMR) effect. The calculations show that the coherent transmission through the 3d states is greatly suppressed by electron correlations. This is mainly due to the finite lifetime induced by the electron-electron interaction and is directly related to the imaginary part of the computed many-body DMFT self-energy. At the Fermi energy, where in accordance with the Fermi-liquid behavior the imaginary part of the self-energy vanishes, the suppression of the transmission is entirely due to the shifts of the energy spectrum induced by electron correlations. Based on our results, we finally suggest that the GMR measured in Cu/Co heterostructures for electrons with energies about 1 eV above the Fermi energy is a manifestation of dynamical correlation effects.
dc.identifier.doi10.1103/physrevb.106.075156
dc.identifier.issn2469-9950
dc.identifier.issn2469-9969
dc.identifier.scopus2-s2.0-85137686507
dc.identifier.urihttps://pub.ipb.ac.rs/handle/123456789/30
dc.identifier.wos000850784800003
dc.language.isoen
dc.publisherAmerican Physical Society (APS)
dc.relation.ispartofPhysical Review B
dc.relation.ispartofabbrPhys. Rev. B
dc.rightsopenAccess
dc.titleDynamical mean-field theory for spin-dependent electron transport in spin-valve devices
dc.typejournal-article
dc.type.versionpublishedVersion
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