Berlin 2005 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 21: Symposium Frustrated Systems

TT 21.3: Fachvortrag

Montag, 7. März 2005, 14:50–15:15, TU H104

Charge degrees of freedom in frustrated lattices — •Peter Fulde — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 011787 Dresden

We consider electrons with strong short-range correlations in a pyrochlore lattice and its two-dimensional analogue, the checkerboard lattice. There are strong indications that at quarter filling (or half-filling in the case of spinless fermions) excitations exist with a charge e/2. For the checkerboard lattice extensive numerical calculations have been done which support that conjecture [1]. This, as well as the role of the spin and of statistics will be discussed. Some of the findings should also hold for a number of other frustrated lattices.

[1] E. Runge and P. Fulde, Phys. Rev. (in print)