Disorder-induced enhancement of the persistent current for strongly interacting electrons in one-dimensional rings

TL;DR

This paper demonstrates that in strongly interacting one-dimensional rings, disorder can unexpectedly enhance the persistent current, a phenomenon analyzed through perturbative and numerical methods starting from a Mott insulator state.

Contribution

It reveals the counterintuitive effect of disorder increasing persistent current in strongly correlated 1D systems, supported by analytical and numerical evidence.

Findings

Disorder enhances persistent current in strongly interacting 1D rings.

Analytical perturbative approach confirms numerical results.

Effect originates from perturbation around the Mott insulator ground state.

Abstract

We show that disorder increases the persistent current of a half-filled one-dimensional Hubbard-Anderson ring at strong interaction. This unexpected effect results from a perturbative expansion starting from the strongly interacting Mott insulator ground state. The analytical result is confirmed and extended by numerical calculations.