Spin-selective metal insulator transition in two dimensions

TL;DR

This paper investigates a spin-selective disorder in a two-dimensional Hubbard model, revealing a sensitive metal-insulator transition influenced by electron filling, using Quantum Monte Carlo simulations.

Contribution

It introduces a study of spin-selective disorder effects on localization transition in 2D Hubbard models with Quantum Monte Carlo methods.

Findings

Possible metal-insulator transition identified

Transition is highly sensitive to filling fraction

Quantum Monte Carlo effectively analyzes spin-selective disorder

Abstract

The phenomenon of Anderson localization wherein non-interacting electrons are localized by quenched impurities is a subject matter that has been extremely well studied. However, localization transition under the combined influence of interaction and quenched disorder is less well understood. In this context we study the localization transition in a two-dimensional Hubbard model under the influence of a spin-selective disorder i.e, disorder which is operational on just one of the spin-species. The model is analyzed by laying recourse to a Quantum Monte Carlo based scheme. Using this approach we show the possibility of a metal-insulator transition. However, we will show that this metal-insulator transition is extremely sensitive to the filling-fraction inherent in the system.