title: Influence of long-range interactions on charge ordering phenomena on a square lattice.
abstract: Usually complex charge ordering phenomena arise due to competing interactions. We have studied how such ordered patterns emerge from the frustration of a long-ranged interaction on a lattice. Using the lattice gas model on a square lattice with fixed particle density, we have identified several interesting phases, such as a generalization of Wigner crystals at low particle densities and stripe phases at densities between ρ=1/3 and 1/2. These stripes act as domain walls in the checkerboard phase present at half-filling. The phases are characterized at zero temperatures using numerical simulations, and mean field theory is used to construct a finite temperature phase diagram.
authors.affiliation: Institute-Lorentz for Theoretical Physics, Leiden University, PO Box 9506, NL-2300 RA Leiden, The Netherlands.
authors.forename: Louk
authors.initials: L
authors.lastname: Rademaker
authors.forename: Yohanes
authors.initials: Y
authors.lastname: Pramudya
authors.forename: Jan
authors.initials: J
authors.lastname: Zaanen
authors.forename: Vladimir
authors.initials: V
authors.lastname: Dobrosavljević