Spin-selective localization of correlated lattice fermions

TL;DR

This paper explores how spin-dependent disorder affects correlated lattice fermions, revealing a unique spin-selective localized phase that differs from traditional disorder effects, using advanced theoretical methods.

Contribution

It introduces the concept of spin-selective localization driven by spin-dependent disorder and maps its phase diagram using dynamical mean-field theory.

Findings

Spin-dependent disorder destabilizes metallic phases.

A novel spin-selective localized phase emerges at weak interactions and strong disorder.

The phase diagram shows distinct regions for metallic, localized, and spin-selective phases.

Abstract

The interplay between local, repulsive interactions and disorder acting only on one spin orientation of lattice fermions ("spin-dependent disorder") is investigated. The nonmagnetic disorder vs. interaction phase diagram is computed using Dynamical Mean-Field Theory in combination with the geometric average over disorder. The latter determines the typical local density of states and is therefore sensitive to Anderson localization. The effect of spin-dependent disorder is found to be very different from that of conventional disorder. In particular, it destabilizes the metallic solution and leads to a novel spin-selective, localized phase at weak interactions and strong disorder.