Ground-state phase diagrams of the generalized Falicov-Kimball model with Hund coupling

Abstract

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.

10 pages, 6 figures; Fig. 2 slightly modified and the text adjusted accordingly, references added

References in corpus (5)

• Slave-boson approach to the metallic stripe phases with large unit cells
• Phase separation in a two-band model for strongly correlated electrons
• Microscopic origin of diagonal stripe phases in doped nickelates
• Hund's rule and metallic ferromagnetism
• Charge Order in the Falicov-Kimball Model

Cited by in corpus (4)

• Formation of charge and spin ordering in strongly correlated electron systems
• Enhancement of the d-wave pairing correlations by charge and spin ordering in the spin-one-half Falicov-Kimball model with Hund and Hubbard~coupling
• Influence of spin ordering on superconducting correlations in the spin-one-half Falicov-Kimball model with Hund and Hubbard coupling
• Extended Falicov-Kimball model at weak onsite and intersite Coulomb interactions