Effect of external electric field on the charge density waves in one-dimensional Hubbardsuperlattices

Abstract

We have studied the ground state of one-dimensional Hubbard superlattice structures withdifferent unit-cell sizes in the presence of an electric field. A self-consistent Hartree–Fockapproximation calculation is done in the weak- to intermediate-interaction regime.Studying the charge gap at the Fermi level and the charge density structure factor,we get an idea of how the charge modulation on the superlattice is governedby the competition between the electronic correlation and the external electricfield.