Electronic and magnetic properties of metallic phases under coexisting short-range interaction and diagonal disorder

TL;DR

This paper investigates how short-range interactions and diagonal disorder influence the electronic and magnetic properties of a 3D Anderson-Hubbard model, revealing suppressed density of states and frozen spin moments near the metal-insulator transition.

Contribution

It introduces a study of the Anderson-Hubbard model considering both interactions and disorder within Hartree-Fock, highlighting new insights into the density of states and magnetic moments.

Findings

Suppressed density of states at the Fermi energy near transition

Presence of frozen spin moments in the paramagnetic metal

Contrast with dynamical mean field theory results

Abstract

We study a three-dimensional Anderson-Hubbard model under the coexistence of short-range interaction and diagonal disorder within the Hartree-Fock approximation. We show that the density of states at the Fermi energy is suppressed in the metallic phases near the metal-insulator transition as a proximity effect of the soft Hubbard gap in the insulating phases. The transition to the insulator is characterized by a vanishing DOS in contrast to formation of a quasiparticle peak at the Fermi energy obtained by the dynamical mean field theory in pure systems. Furthermore, we show that there exist frozen spin moments in the paramagnetic metal.