Topological Anderson insulating phases in the interacting Haldane model

TL;DR

This paper investigates how disorder and strong interactions influence topological phases in the Haldane model, revealing disorder can promote topology and induce novel phases with coexisting orders.

Contribution

It demonstrates that disorder extends topological phases in the interacting Haldane model and uncovers a new disorder-driven topological phase with coexisting spin and charge order.

Findings

Disorder favors topological phases in the interacting Haldane model.

A novel disorder-driven topological phase with Chern number C=1 is identified.

Conventional topological Anderson insulators are observed with a finite staggered potential.

Abstract

We analyze the influence of disorder and strong correlations on the topology in two dimensional Chern insulators. A mean field calculation in the half-filled Haldane model with extended Hubbard interactions and Anderson disorder shows that disorder favors topology in the interacting case and extends the topological phase to a larger region of the Hubbard parameters. In the absence of a staggered potential, we find a novel disorder-driven topological phase with Chern number C=1, with co-existence of topology with long range spin and charge orders. More conventional topological Anderson insulating phases are also found in the presence of a finite staggered potential.