The asymmetric Hubbard model on a two-dimensional cluster
Zbigniew Domanski; Romuald Lemanski; Gábor Fáth; Zbigniew Domanski; Institute of Theoretical Physics, University of Lausanne, CH-1015 Lausanne, Switzerland; Romuald Lemanski; Institute of Theoretical Physics, University of Lausanne, CH-1015 Lausanne, Switzerland; Gábor Fáth; Institute of Theoretical Physics, University of Lausanne, CH-1015 Lausanne, Switzerland
Журнал:
Journal of Physics: Condensed Matter
Дата:
1996-04-22
Аннотация:
An interaction between two heavy electrons mediated by two light electrons is investigated within the asymmetric Hubbard model on a square cluster with sites. The pair correlation function describing the probabilities of all relative positions of the heavy electrons is calculated by an approximative method. An effective attraction is found to exist in a certain range of model parameters.
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