Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 16: Posters Correlated Electrons, Measuring Devices, Cryotechnique

TT 16.29: Poster

Samstag, 5. März 2005, 11:00–16:30, Poster TU C

Metal-insulator transition in the Hubbard Model at finite doping and temperature — •Rolf Helmes, Achim Rosch, and Theo Costi — Institut für Theoretische Physik, Universität zu Köln

The dynamical mean field theory in combination with the numerical renormalization group is used to compute the phase diagram of the Hubbard model away from half-filling in the (T,U) plane. We find regions of coexistance of two solutions with the same doping at finite temperature, as for half filling. In addition we find regions of phase-separation. We discuss the effect of particle-hole asymmetry on the phase diagram at half-filling, and the influence of a small doping on the single-particle spectra of a Mott insulator.