Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 15: Korrelierte Elektronen: Theorie I

TT 15.6: Vortrag

Dienstag, 9. März 2004, 15:45–16:00, H19

Periodic Anderson Model in the Charge Transfer Regime — •Konrad Matho — CRTBT CNRS, 38042 GRENOBLE CEDEX 9, FRANCE

We have proposed a fast track to calculate correlated fermionic Green functions in momentum representation as Padé approximants, with the aim of data analysis in ARPES experiments (J.Electr.Spectr.Rel.Phen.117,13 (2001)). A stringent test is the comparison to microscopic results beyond the one band Hubbard model. Therefore, we have implemented spectra of the periodic Anderson model. In this talk, we focus on the generics of charge transfer phenomena in a range of metallic densities above and below one hole per site and discuss the following properties: (i) Position of the chemical potential (ii) Position and width of charge gap and Hubbard satellites (iii) Existence of quasiparticle bands and their dependence on charge transfer and hybridisation strength (iv) Differences in the spectra upon electron doping versus hole doping (v) Spin correlations of the Zhang-Rice type.