Regensburg 2004 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 26: Korrelierte Elektronen: Theorie II

TT 26.9: Vortrag

Donnerstag, 11. März 2004, 11:45–12:00, H18

Gossamer metals — •Marcus Kollar — Institut für Theoretische Physik, Universität Frankfurt, Robert-Mayer-Str. 8, 60054 Frankfurt/Main

Using Laughlin’s gossamer method we construct a class of extended Hubbard models with long-range correlated hopping that have exact metallic Gutzwiller ground states, with arbitrary particle density, non-interacting dispersion, and lattice dimensionality [1]. The susceptibility and magnetization curves are obtained, showing that the Pauli susceptibility is enhanced by correlations. The elementary quasiparticle excitations of this correlated “gossamer metal” are gapless, except for a half-filled band, where a Mott metal-insulator transition of Brinkman-Rice type occurs.

[1] M. Kollar, cond-mat/0308513.