Topological Superconductors in Correlated Chern Insulators

TL;DR

This paper demonstrates the realization of a topological superconductor with Chern number 2 in a correlated Haldane model using mean field and RPA methods, revealing edge states and zero modes.

Contribution

It introduces a new topological superconductor phase in the correlated Haldane model with detailed analysis of its properties.

Findings

Ground state is a topological superconductor with Chern number 2

Edge states are present in the TSC phase

Zero modes are found at pi-flux in the TSC

Abstract

In this paper, we realize a topological superconductor (TSC) in correlated topological insulator - the interacting spinful Haldane model. We consider the electrons on the Haldane model with on-site negative-U interaction and then study its properties by mean field theory and random-phase-approximation (RPA) approach. We found that in the intermediate interaction region, the ground state becomes a TSC with the Chern number 2. We also study its edge states and the zero modes of the pi-flux.