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dc.contributor.authorHyrkäs, Markku
dc.contributor.authorKarlsson, Daniel
dc.contributor.authorvan Leeuwen, Robert
dc.date.accessioned2020-01-17T07:18:24Z
dc.date.available2020-04-23T21:35:13Z
dc.date.issued2019
dc.identifier.citationHyrkäs, M., Karlsson, D., & van Leeuwen, R. (2019). Diagrammatic Expansion for Positive Spectral Functions in the Steady-State Limit. <i>Physica Status Solidi. B: Basic Research</i>, <i>256</i>(7), 1800615. <a href="https://doi.org/10.1002/pssb.201800615" target="_blank">https://doi.org/10.1002/pssb.201800615</a>
dc.identifier.otherCONVID_30538078
dc.identifier.otherTUTKAID_81269
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/67347
dc.description.abstractRecently, a method was presented for constructing self‐energies within many‐body perturbation theory that is guaranteed to produce a positive spectral function for equilibrium systems, by representing the self‐energy as a product of half‐diagrams on the forward and backward branches of the Keldysh contour [Phys. Rev. B 2014, 90, 115134]. An alternative half‐diagram representation that is based on products of retarded diagrams is derived here. This approach extends the method to systems out of equilibrium. When a steady‐state limit exists, it is shown that our approach yields a positive definite spectral function in the frequency domain.fi
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherWiley - VCH Verlag GmbH & Co. KGaA
dc.relation.ispartofseriesPhysica Status Solidi. B: Basic Research
dc.rightsIn Copyright
dc.subject.othernon-equilibrium Green's functions
dc.subject.otherperturbation theory
dc.subject.otherspectral properties
dc.titleDiagrammatic Expansion for Positive Spectral Functions in the Steady-State Limit
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-202001081106
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.contributor.oppiaineNanoscience Centerfi
dc.contributor.oppiaineNanoscience Centeren
dc.type.urihttp://purl.org/eprint/type/JournalArticle
dc.date.updated2020-01-08T13:15:14Z
dc.type.coarhttp://purl.org/coar/resource_type/c_2df8fbb1
dc.description.reviewstatuspeerReviewed
dc.format.pagerange1800615
dc.relation.issn0370-1972
dc.relation.numberinseries7
dc.relation.volume256
dc.type.versionacceptedVersion
dc.rights.copyright© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
dc.rights.accesslevelopenAccessfi
dc.relation.grantnumber308697
dc.relation.grantnumber317139
dc.subject.ysokvanttifysiikka
dc.format.contentfulltext
jyx.subject.urihttp://www.yso.fi/onto/yso/p5564
dc.rights.urlhttp://rightsstatements.org/page/InC/1.0/?language=en
dc.relation.doi10.1002/pssb.201800615
dc.relation.funderSuomen Akatemiafi
dc.relation.funderSuomen Akatemiafi
dc.relation.funderResearch Council of Finlanden
dc.relation.funderResearch Council of Finlanden
jyx.fundingprogramTutkijatohtori, SAfi
jyx.fundingprogramAkatemiahanke, SAfi
jyx.fundingprogramPostdoctoral Researcher, AoFen
jyx.fundingprogramAcademy Project, AoFen
jyx.fundinginformationD.K. acknowledges the Academy of Finland for funding under Project No. 308697. M.H. thanks the Finnish Cultural Foundation for support. R.v.L. acknowledges the Academy of Finland for funding under Project No. 317139.
dc.type.okmA1


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