Effect of external electric field on the charge density waves in one dimensional Hubbard superlattices

TL;DR

This paper investigates how external electric fields influence charge density waves in one-dimensional Hubbard superlattices, revealing the interplay between electronic correlations and electric fields on charge modulation.

Contribution

It provides a detailed analysis of the ground state properties of Hubbard superlattices under electric fields using self-consistent Hartree-Fock calculations, highlighting the effects of unit cell size and interaction strength.

Findings

Charge gap varies with electric field and interaction strength.

Charge density modulation is governed by competition between correlations and electric field.

Electric field can induce or suppress charge density waves.

Abstract

We have studied the ground state of the one dimensional Hubbard superlattice structures with different unit cell sizes in the presence of electric field. Self consistent Hartree-Fock approximation 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 how the charge modulation on the superlattice is governed by the competition between the electronic correlation and the external electric field.