Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 32: Theoretische Modelierung von Materialien mit korrelierten Elektronen

TT 32.5: Vortrag

Freitag, 12. März 2004, 11:15–11:30, H18

Spectral functions for systems with Hund’s rule correlated 5f electrons — •Frank Pollmann and Gertrud Zwicknagl — Institut für Mathematische Physik, TU-Braunschweig, Mendelssohnstraße 3, 38106 Braunschweig

We calculate the spectral functions for systems with 5f electrons by performing exact diagonalization of small clusters and treating the intercluster hopping as a perturbation. The perturbation is treated in the formalism of the Strong Coupling Theory. In the calculated spectra well defined quasiparticles and partial localization are observed.
The obtained results are compared with data from exact diagonalization of finite clusters and measurements by angle resolved-photoemission spectroscopy (ARPES).