Effects of nanoscale spatial inhomogeneity in strongly correlated systems
Abstract
We calculate ground-state energies and density distributions of Hubbard superlattices characterized by periodic modulations of the on-site interaction and the on-site potential. Both density-matrix renormalization group and density-functional methods are employed and compared. We find that small variations in the on-site potential vi can simulate, cancel, or even overcompensate effects due to much larger variations in the on-site interaction Ui . Our findings highlight the importance of nanoscale spatial inhomogeneity in strongly correlated systems, and call for a reexamination of model calculations assuming spatial homogeneity.
- Publication:
-
Physical Review B
- Pub Date:
- March 2005
- DOI:
- 10.1103/PhysRevB.71.125130
- arXiv:
- arXiv:cond-mat/0502355
- Bibcode:
- 2005PhRvB..71l5130S
- Keywords:
-
- 71.10.Fd;
- 71.10.Pm;
- 71.15.Mb;
- 71.27.+a;
- Lattice fermion models;
- Fermions in reduced dimensions;
- Density functional theory local density approximation gradient and other corrections;
- Strongly correlated electron systems;
- heavy fermions;
- Condensed Matter - Strongly Correlated Electrons;
- Condensed Matter - Materials Science
- E-Print:
- 5 pages, 1 table, 4 figures, to appear in PRB