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dc.contributor.authorCosco, Francesco
dc.contributor.authorTuovinen, Riku
dc.contributor.authorLo Gullo, Nicolino
dc.date.accessioned2024-04-26T10:19:37Z
dc.date.available2024-04-26T10:19:37Z
dc.date.issued2024
dc.identifier.citationCosco, F., Tuovinen, R., & Lo Gullo, N. (2024). Interacting Electrons in a Flat‐Band System within the Generalized Kadanoff–Baym Ansatz. <i>Physica Status Solidi B : Basic Research</i>, <i>Early View</i>. <a href="https://doi.org/10.1002/pssb.202300561" target="_blank">https://doi.org/10.1002/pssb.202300561</a>
dc.identifier.otherCONVID_207737878
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/94513
dc.description.abstractIn this work, the study of the spectral properties of an open interacting system by solving the generalized Kadanoff-Baym ansatz (GKBA) master equation for the single-particle density matrix, namely the time-diagonal lesser Green's function, is reported. To benchmark its validity, the solution obtained within the GKBA is compared with the solution of the Dyson equation at stationarity. In both approaches, the interaction is treated within the self-consistent second-order Born approximation, whereas the GKBA still retains the retarded propagator calculated at the Hartree–Fock (HF) and wideband limit approximation level. The model chosen is that of two leads connected through a central correlated region where particles can interact and utilize the stationary particle current at the boundary of the junction as a probe of the spectral features of the system. The central region is chosen as the simplest model featuring a degenerate ground state with a flat band. The main result is that the solution of the GKBA master equation captures well the spectral feature of such system and specifically the transition from dispersionless to dispersive behavior of the flat band as the interaction is increased. Therefore, the GBKA solution retains the main spectral features of the self-energy used even when the propagator is at the HF level.en
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherWiley-VCH Verlag
dc.relation.ispartofseriesPhysica Status Solidi B : Basic Research
dc.rightsIn Copyright
dc.subject.otherflat bands
dc.subject.othergeneralized Kadanoff–Baym ansatz
dc.subject.otherquantum transports
dc.titleInteracting Electrons in a Flat‐Band System within the Generalized Kadanoff–Baym Ansatz
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202404263140
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.type.coarhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.description.reviewstatuspeerReviewed
dc.relation.issn0370-1972
dc.relation.volumeEarly View
dc.type.versionacceptedVersion
dc.rights.copyright© 2024 Wiley-VCH GmbH
dc.rights.accesslevelembargoedAccessfi
dc.subject.ysokvanttifysiikka
dc.subject.ysoosittaisdifferentiaaliyhtälöt
dc.subject.ysomatemaattiset mallit
dc.subject.ysokiinteän olomuodon fysiikka
dc.subject.ysoelektronit
dc.subject.ysonumeerinen analyysi
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p5564
jyx.subject.urihttp://www.yso.fi/onto/yso/p12392
jyx.subject.urihttp://www.yso.fi/onto/yso/p11401
jyx.subject.urihttp://www.yso.fi/onto/yso/p914
jyx.subject.urihttp://www.yso.fi/onto/yso/p4030
jyx.subject.urihttp://www.yso.fi/onto/yso/p15833
dc.rights.urlhttp://rightsstatements.org/page/InC/1.0/?language=en
dc.relation.doi10.1002/pssb.202300561
jyx.fundinginformationNumerical simulations were performed using the Finnish CSC facilities under the project no. 2000962 (“Thermo electric effects in nanoscale devices”).
dc.type.okmA1


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