Multi-orbital Anderson models and the Kondo effect

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dc.creatorGrewe, Norbert
dc.creatorJabben, Torben
dc.creatorSchmitt, Sebastian
dc.date2008-10-27
dc.date.accessioned2026-07-07T10:13:22Z
dc.date.available2026-07-07T10:13:22Z
dc.descriptionThe low energy region of certain transition metal compounds reveals dramatic correlation effects between electrons, which can be studied by photoelectron spectroscopy. Theoretical investigations are often based on multi-orbital impurity models, which reveal modified versions of the Kondo effect. We present a systematic study of a multi-orbital Anderson-like model, based on a new semi-analytical impurity solver which goes beyond simple modifications of the well known NCA. We discuss one-particle excitation spectra and in particular the role of level positions and Coulomb-matrix elements. It is shown that the low-energy region as well as the overall features of spectra critically depend on the model parameters and on the quality of the approximations used. Recent photoelectron experiments and corresponding existing calculations are put into perspective. An interesting crossover scenario between different regimes of ground states with characteristically different local correlations is uncovered.
dc.identifierhttps://arxiv.org/abs/0810.4783
dc.identifierhttp://arxiv.org/abs/0810.4783
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/172508
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titleMulti-orbital Anderson models and the Kondo effect
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