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dc.contributor.authorAase, Niels Henrik
dc.contributor.authorJohnsen, Christian Svingen
dc.contributor.authorSudbø, Asle
dc.date.accessioned2023-07-26T14:41:50Z
dc.date.available2023-07-26T14:41:50Z
dc.date.created2023-07-24T17:33:59Z
dc.date.issued2023
dc.identifier.issn2469-9950
dc.identifier.urihttps://hdl.handle.net/11250/3081467
dc.description.abstractWe consider superconductivity in a system with N Fermi surfaces, including intraband and interband effective electron-electron interactions. The effective interaction is described by an N × N matrix whose elements are assumed to be constant in thin momentum shells around each Fermi surface, giving rise to s -wave superconductivity. Starting with attractive intraband interactions in all N bands, we show that too strong interband interactions are detrimental to sustaining N nonzero components of the superconducting order parameter. We find similar results in systems with repulsive intraband interactions. The dimensionality reduction of the order-parameter space is given by the number of nonpositive eigenvalues of the interaction matrix. Using general models and models for superconducting transition metal dichalcogenides and iron pnictides frequently employed in the literature, we show that constraints must be imposed on the order parameter to ensure a lower bound on the free energy and that subsequent higher-order expansions around the global minimum are thermodynamically stable. We also demonstrate that similar considerations are necessary for unconventional pairing symmetries.en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.relation.urihttps://journals.aps.org/prb/abstract/10.1103/PhysRevB.108.024509
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.subjectMultibånd superledningen_US
dc.subjectMultiband superconductivityen_US
dc.subjectSuperledningen_US
dc.subjectSuperconductivityen_US
dc.titleConstrained s-wave weak-coupling superconductivity in multiband superconductorsen_US
dc.title.alternativeConstrained s-wave weak-coupling superconductivity in multiband superconductorsen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.description.versionacceptedVersionen_US
dc.subject.nsiVDP::Kondenserte fasers fysikk: 436en_US
dc.subject.nsiVDP::Condensed matter physics: 436en_US
dc.source.volume108en_US
dc.source.journalPhysical review B (PRB)en_US
dc.source.issue2en_US
dc.identifier.doi10.1103/PhysRevB.108.024509
dc.identifier.cristin2163313
dc.relation.projectNorges forskningsråd: 262633en_US
dc.relation.projectNorges forskningsråd: 323766en_US
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal