Correlated states in a model two-dimensional layer

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Abstract
We present results of a calculation to model the behavior of density-wave correlated states in layered compounds of the trigonal prismatic type. The effect of an attractive or repulsive intrasite interaction between itinerant electrons is studied in the Hartree-Fock approximation for a two-dimensional band structure. The stable state depends on the electron-electron interaction parameter and it may be (i) the normal paramagnetic state, (ii) the ferromagnetic state, (iii) a single charge-density wave, (iv) a single spin-density wave, (v) a triple charge-density wave, (vi) a novel asymmetric charge-density wave, or (vii) a mixed state which shows spin and charge-density waves for repulsive electron-electron interactions. The solutions are characterized by a generalized conductivity.