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TT: Tiefe Temperaturen

TT 6: Correlated Electrons - (General) Theory I

TT 6.2: Vortrag

Freitag, 4. März 2005, 14:15–14:30, TU H2053

Spectral functions of some frustrated lattice structures with charge degrees of freedom — •Frank Pollmann¹, Peter Fulde¹, and Erich Runge² — ¹Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany — ²Technische Universität Ilmenau, Fakultät für Mathematik und Naturwissenschaften, 98684 Ilmenau, Germany

Geometrical frustration of lattices leads to many interesting physical effects. While the magnetic properties of frustrated lattices have already received wide interest, one recently began to explore the charge degrees of freedom. In particular it has been proposed that excitations carrying charge e/2 should exist. However, it is not clear whether these excitations can separate from each other or are confined. For a deeper understanding of the dynamics of these charge degrees of freedom we calculated numerically the spectral functions of spinless fermions on finite checkerboard- and kagomé lattices. In both cases the spectral functions indicate a strong non-Fermi liquid behaviour. Furthermore we compare our results with analogous bosonic systems.