Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-11-28
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 6 figures
Scientific paper
The Kondo-lattice model is well established as a method to describe an exchange coupling between single conduction electrons and localized magnetic moments. As a nontrivial exact result the zero-bandwidth limit (atomic limit) can be used to test approximations for this model. As soon as the translational symmetry is broken (for instance by sublattice structures) it is necessary to consider more than one lattice site. Therefore, we study as a starting point for generalizations the situation of a two-site cluster. An equation-of-motion approach is chosen to obtain the one-particle Green's function. In order to determine the spectral weights of its energy poles, we derive different possibilities for the calculation of the involved correlation functions. In this paper the analytical exact result for the situation of an insulator is presented. In a forthcoming article we generalize the calculations to arbitrary electron densities, keeping as the only constraint S=1/2.
Hickel Tilmann
Nolting Wolfgang
Roeseler J.
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