Effects of nanoscale spatial inhomogeneity in strongly correlated systems

Details Effects of nanoscale spatial inhomogeneity in strongly correlated systems Effects of nanoscale spatial inhomogeneity in strongly correlated systems

2005-02-15

arxiv.org/abs/cond-mat/0502355v1

Phys. Rev. B 71, p. 125130 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 table, 4 figures, to appear in PRB

Scientific paper

10.1103/PhysRevB.71.125130

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 $v_i$ can simulate, cancel, or even overcompensate effects due to much larger variations in the on-site interaction $U_i$. 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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