Conductivity in the Square Lattice Hubbard Model at High Temperatures: Importance of Vertex Corrections

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dc.citation.issue3
dc.citation.rankM21a
dc.citation.spage036601
dc.citation.volume123
dc.contributor.authorVučičević, Jakša
dc.contributor.authorKokalj, Jure
dc.contributor.authorŽitko, Rok
dc.contributor.authorWentzell, Nils
dc.contributor.authorTanasković, Darko
dc.contributor.authorMravlje, Jernej
dc.date.accessioned2024-06-25T10:35:04Z
dc.date.available2024-06-25T10:35:04Z
dc.date.issued2019-07-19
dc.description.abstractRecent experiments on cold atoms in optical lattices allow for a quantitative comparison of the measurements to the conductivity calculations in the square lattice Hubbard model. However, the available calculations do not give consistent results, and the question of the exact solution for the conductivity in the Hubbard model remained open. In this Letter, we employ several complementary state-of-the-art numerical methods to disentangle various contributions to conductivity and identify the best available result to be compared to experiment. We find that, at relevant (high) temperatures, the self-energy is practically local, yet the vertex corrections remain rather important, contrary to expectations. The finite-size effects are small even at the lattice size 4×4, and the corresponding Lanczos diagonalization result is, therefore, close to the exact result in the thermodynamic limit.
dc.identifier.doi10.1103/physrevlett.123.036601
dc.identifier.issn0031-9007
dc.identifier.issn1079-7114
dc.identifier.scopus2-s2.0-85069956352
dc.identifier.urihttps://pub.ipb.ac.rs/handle/123456789/138
dc.identifier.wos000476696200012
dc.language.isoen
dc.publisherAmerican Physical Society (APS)
dc.relation.ispartofPhysical Review Letters
dc.relation.ispartofabbrPhys. Rev. Lett.
dc.rightsrestrictedAccess
dc.titleConductivity in the Square Lattice Hubbard Model at High Temperatures: Importance of Vertex Corrections
dc.typeArticle
dc.type.versionpublishedVersion
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