Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-05-27
Physics
Condensed Matter
Strongly Correlated Electrons
18 pages, 9 figures
Scientific paper
The spin-one-half Falicov-Kimball model with spin-dependent on-site interaction between localized ($f$) and itinerant ($d$) electrons is studied by small-cluster exact-diagonalization calculations and a well-controlled approximative method in two dimensions. The results obtained are used to categorize the ground-state configurations according to common features (charge and spin ordering) for all $f$ and $d$ electron concentrations ($n_f$ and $n_d$) on finite square lattices. It is shown that only a few configuration types form the basic structure of the charge phase diagram in the $n_f-n_d$ plane. In particular, the largest regions of stability correspond to the phase segregated configurations, the axial striped configurations and configurations that can be considered as mixtures of chessboard configurations and the full (empty) lattice. Since the magnetic phase diagram is much richer than the charge phase diagram, the magnetic superstructures are examined only at selected values of $f$ and $d$ electron concentrations.
Cencarikova Hana
Farkasovsky Pavol
Tomasovicov Natalia
Zonda Martin
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