id,collection,dc.contributor.author[],dc.date.accessioned[],dc.date.available[],dc.date.issued[],dc.description.abstract[en],dc.format.extent[],dc.identifier.uri,dc.identifier.uri[],dc.language[],dc.rights.uri[],dc.subject.ddc[],dc.subject[en],dc.title[],dc.type[],dcterms.accessRights.openaire,dcterms.bibliographicCitation.doi[],dcterms.bibliographicCitation.journaltitle[],dcterms.bibliographicCitation.number[],dcterms.bibliographicCitation.url[],dcterms.bibliographicCitation.volume[],refubium.affiliation[] "0be46407-fca6-4f67-9a88-379923bc43e1","fub188/16","Fräßdorf, Christian||Mosig, Johannes E. M.","2019-01-17T12:10:56Z","2019-01-17T12:10:56Z","2017","We construct a nonperturbative nonequilibrium theory for graphene electrons interacting via the instantaneous Coulomb interaction by combining the functional renormalization group method with the nonequilibrium Keldysh formalism. The Coulomb interaction is partially bosonized in the forward scattering channel resulting in a coupled Fermi-Bose theory. Quantum kinetic equations for the Dirac fermions and the Hubbard-Stratonovich boson are derived in Keldysh basis, together with the exact flow equation for the effective action and the hierarchy of one-particle irreducible vertex functions, taking into account a possible nonzero expectation value of the bosonic field. Eventually, the system of equations is solved approximately under thermal equilibrium conditions at finite temperature, providing results for the renormalized Fermi velocity and the static dielectric function, which extends the zero-temperature results of Bauer et al., Phys. Rev. B 92, 121409 (2015).","22 Seiten","http://dx.doi.org/10.17169/refubium-1481","https://refubium.fu-berlin.de/handle/fub188/23694","eng","http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen","500 Naturwissenschaften und Mathematik::530 Physik::530 Physik","Effective field theory||Electronic structure||Finite temperature field theory||Nonperturbative effects in field theory||Renormalization group||Graphene","Keldysh functional renormalization group for electronic properties of graphene","Wissenschaftlicher Artikel","open access","10.1103/PhysRevB.95.125412","Physical Review B","12","https://doi.org/10.1103/PhysRevB.95.125412","95","Physik"