Optical and dctransport properties of a strongly correlated chargedensitywave system: Exact solution in the ordered phase of the spinless FalicovKimball model with dynamical meanfield theory
Abstract
We derive the dynamical meanfield theory equations for transport in an ordered chargedensitywave phase on a bipartite lattice. The formalism is applied to the spinless FalicovKimball model on a hypercubic lattice at half filling. We determine the manybody density of states, the dc charge and heat conductivities, and the optical conductivity. Vertex corrections continue to vanish within the ordered phase, but the density of states and the transport coefficients show anomalous behavior due to the rapid development of thermally activated subgap states. We also examine the optical sum rule and sum rules for the first three moments of the Green’s functions within the ordered phase and see that the total optical spectral weight in the ordered phase either decreases or increases depending on the strength of the interactions.
 Publication:

Physical Review B
 Pub Date:
 January 2008
 DOI:
 10.1103/PhysRevB.77.035102
 arXiv:
 arXiv:0708.2748
 Bibcode:
 2008PhRvB..77c5102M
 Keywords:

 71.10.Fd;
 71.45.Lr;
 72.15.Eb;
 Lattice fermion models;
 Chargedensitywave systems;
 Electrical and thermal conduction in crystalline metals and alloys;
 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 14 pages, 14 figures, submitted to Phys. Rev. B