20 citations · 30 across the 3 of their papers we have counts for
4 papers · 1 filter
Description of molecular nanomagnets by the multi-orbital Hubbard model with correlated hopping
Jacek Matysiak, Romuald Lemański
We present a microscopic description of molecular magnets by the multi-orbital Hubbard model, which includes the correlated hopping term, i.e. the dependence of electron hopping am…
Extended Falicov-Kimball model at weak onsite and intersite Coulomb interactions
K. J. Kapcia, J. Krawczyk, R. Lemański
We analyze in detail a behavior of the order parameter in the half-filled extended Falicov-Kimball model for small Coulomb interactions (both onsite and intersite ). The par…
Two-orbital Hubbard model vs spin Heisenberg model: studies on clusters
R. Lemański, J. Matysiak
We perform exact numeric calculations for the two-orbital Hubbard model on the four-site cluster. In the limit of large on-site coupling the model becomes equivalent to the spin $S…
Ground-state phase diagrams of the generalized Falicov-Kimball model with Hund coupling
Romuald Lemański, Jakub Wrzodak
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 e…