Otro
Effects of nanoscale spatial inhomogeneity in strongly correlated systems
Registro en:
Physical Review B. College Pk: Amer Physical Soc, v. 71, n. 12, 5 p., 2005.
1098-0121
10.1103/PhysRevB.71.125130
WOS:000228923300056
WOS000228923300056.pdf
Autor
Silva, M. F.
Lima, N. A.
Malvezzi, André Luiz
Capelle, K.
Resumen
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.