Berlin 2005 – scientific programme
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TT: Tiefe Temperaturen
TT 6: Correlated Electrons - (General) Theory I
TT 6.2: Talk
Friday, March 4, 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.