Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-05-26
Physical Review B 78, 085118 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 6 figures; Fig. 2 slightly modified and the text adjusted accordingly, references added
Scientific paper
10.1103/PhysRevB.78.085118
Charge and spin orderings are studied on the simplest 1D and the 2D square lattice within the generalized Falicov-Kimball model with Hund coupling between localized and itinerant electrons. Using the restricted phase diagrams method (RPDM) a number of simple rules of formation of various sorts of ground state phases have been detected. In particular, relationships between density of current carriers (electrons or holes) and type of charge and magnetic arrangement has been determined. In 2D in the mixed valence regime only axial stripes (vertical or horizontal) have been found for intermediate values of the coupling constants. They are composed of ferromagnetic or antiferromagnetic chains interchanged with non-magnetic ones. For band fillings close to the half filling stripe phases oriented along one of the main diagonal direction are formed. The results suggest a possibility of tuning modulations of charge and magnetic superstructures with a change of doping.
Lemanski Romuald
Wrzodak Jakub
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