Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-11-09
Phys. Rev. B 60, 15660 (1999)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 4 figures; to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.60.15660
The Falicov-Kimball model with a correlated-hopping interaction is solved using an extended dynamical mean-field theory that becomes exact in the limit of large dimensions. The effect of correlated hopping is to introduce nonlocal self-energy components that retain full dynamics as D goes to infinity, thus introducing an explicit k-dependence to the single-particle self-energy. An explicit solution for the homogeneous phase at D = 2 reveals significant nonlocal dynamical contributions in the physically relevant regime of a moderately large correlated-hopping amplitude, indicating that important nonlocal correlations are omitted in Hubbard-like models upon neglecting the correlated-hopping interaction.
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