Effects of nanoscale spatial inhomogeneity in strongly correlated systems
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2005-03-01
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Amer Physical Soc
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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 a reexamination of model calculations assuming spatial homogeneity.
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Physical Review B. College Pk: Amer Physical Soc, v. 71, n. 12, 5 p., 2005.