Spectral Functions of the Holstein Polaron: Exact and Approximate Solutions

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dc.citation.issue9
dc.citation.rankM21a
dc.citation.spage096401
dc.citation.volume129
dc.contributor.authorMitrić, Petar
dc.contributor.authorJanković, Veljko
dc.contributor.authorVukmirović, Nenad
dc.contributor.authorTanasković, Darko
dc.date.accessioned2024-06-13T08:04:59Z
dc.date.available2024-06-13T08:04:59Z
dc.date.issued2022-08-22
dc.description.abstractIt is generally accepted that the dynamical mean field theory gives a good solution of the Holstein model, but only in dimensions greater than two. Here, we show that this theory, which becomes exact in the weak coupling and in the atomic limit, provides an excellent, numerically cheap, approximate solution for the spectral function of the Holstein model in the whole range of parameters, even in one dimension. To establish this, we make a detailed comparison with the spectral functions that we obtain using the newly developed momentum-space numerically exact hierarchical equations of motion method, which yields electronic correlation functions directly in real time. We crosscheck these conclusions with our path integral quantum Monte Carlo and exact diagonalization results, as well as with the available numerically exact results from the literature.
dc.identifier.doi10.1103/physrevlett.129.096401
dc.identifier.issn0031-9007
dc.identifier.issn1079-7114
dc.identifier.scopus2-s2.0-85137168928
dc.identifier.urihttps://pub.ipb.ac.rs/handle/123456789/83
dc.identifier.wos000872012400007
dc.language.isoen
dc.publisherAmerican Physical Society (APS)
dc.relation.ispartofPhysical Review Letters
dc.relation.ispartofabbrPhys. Rev. Lett.
dc.rightsrestrictedAccess
dc.titleSpectral Functions of the Holstein Polaron: Exact and Approximate Solutions
dc.typeArticle
dc.type.versionpublishedVersion
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