Effects of Frustrating Hopping on Charge Ordered States in Itinerant Fermion Systems for Arbitrary Concentration in 2D Lattice

Abstract

There is ongoing, intense, research in the eld of electron charge orderings (CO) and charge density waves phenomena, due to experimental discovery of such phases in numerous important compounds. The aim of this work is to extend recent advances in the eld by studying two simple e ective paradigmatic models used to describe CO in narrow band materials i.e. (i) a model of correlated electrons: the so-called t W model of spinless fermions with repulsive interaction W and (ii) the molecular crystal model with the coupling of electrons to intramolecular (crystal eld) vibrations in the static limit. The nite temperature phase diagrams are evaluated at arbitrary carriers concentration for several representative cases. Our calculations are performed within the (broken symmetry) HFA for d = 2 square lattice and arbitrary carriers concentration. In this contribution we focus on the e ects of next-nearest-neighbor hopping on the CO states in these systems and the problem of phase separations involving checkerboard CO with the nesting vector Q = (π, π). The results we show here are an extension of our previous work on the subject.