Two-site dynamical mean-field theory

Details Two-site dynamical mean-field theory Two-site dynamical mean-field theory

2001-07-24

arxiv.org/abs/cond-mat/0107502v1

Phys. Rev. B 64, 165114 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

LaTeX, 14 pages, 8 eps figures included, Phys. Rev. B (in press)

Scientific paper

10.1103/PhysRevB.64.165114

It is shown that a minimum realization of the dynamical mean-field theory (DMFT) can be achieved by mapping a correlated lattice model onto an impurity model in which the impurity is coupled to an uncorrelated bath that consists of a single site only. The two-site impurity model can be solved exactly. The mapping is approximate. The self-consistency conditions are constructed in a way that the resulting ``two-site DMFT'' reduces to the previously discussed linearized DMFT for the Mott transition. It is demonstrated that a reasonable description of the mean-field physics is possible with a minimum computational effort. This qualifies the simple two-site DMFT for a systematic study of more complex lattice models which cannot be treated by the full DMFT in a feasible way. To show the strengths and limitations of the new approach, the single-band Hubbard model is investigated in detail. The predictions of the two-site DMFT are compared with results of the full DMFT. Internal consistency checks are performed which concern the Luttinger sum rule, other Fermi-liquid relations and thermodynamic consistency.

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