Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7376971 | Physica A: Statistical Mechanics and its Applications | 2016 | 15 Pages |
Abstract
The charge ordering is a phenomenon associated with inhomogeneous distribution of electron density occurring mostly in strongly correlated materials such as transition metal oxides or organic conductors. The extended Hubbard model (EHM) is one of the simplest model for description of this phenomenon. The full phase diagram of the EHM with intersite density-density interactions W1 and W2 (nearest- and next-nearest-neighbour, respectively) in the atomic limit as a function of the chemical potential has been derived in the variational approach, which treats the on-site interaction exactly and the intersite interactions within mean-field approximation. The results for arbitrary values of model parameters (in the two-sublattice assumption) reveal that the diagram has very complex structure including various (multi-)critical points. A variety of the transitions between different phases, in particular with long-range charge-order, has been found to occur on the diagram. The results presented are rigorous ones in the high-dimension limit for any W1 and W2â¤0.
Related Topics
Physical Sciences and Engineering
Mathematics
Mathematical Physics
Authors
Konrad Jerzy Kapcia, StanisÅaw Robaszkiewicz,