Ground state phase diagram and magnetoconductance of a one-dimensional Hubbard superlattice at half-filling

TL;DR

This paper investigates the ground state phases and magnetoconductance of a half-filled one-dimensional Hubbard superlattice using mean field and renormalization group methods, revealing phase diagrams, local moment modulations, and conductance behaviors.

Contribution

It introduces a combined mean field and real space renormalization group approach to analyze the phase diagram and magnetoconductance of a Hubbard superlattice at half-filling, highlighting spatial modulation of local moments.

Findings

Phase diagrams agree across methods from weak to intermediate coupling.

Mean field results show rapid convergence with system size.

Magnetoconductance exhibits several notable features.

Abstract

We have studied a one dimensional Hubbard superlattice with different Coulomb correlations at alternating sites for a half-filled band. Mean field calculations based on the Hartree-Fock approximation together with a real space renormalization group technique were used to study the ground state of the system. The phase diagrams obtained in these approaches agree with each other from the weak to the intermediate coupling regime. The mean field results show very quick convergence with system size. The renormalization group results indicate a spatial modulation of local moments that was identified in some previous work. Also we have studied the magnetoconductance of such superlattices which reveals several interesting points.