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 reexamination of model calculations assuming spatial homogeneity.
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