Chiral Spin Liquid in Correlated Topological Insulator

TL;DR

This paper demonstrates the existence of a chiral spin liquid phase in a correlated topological insulator modeled by the topological Hubbard model, using slave-rotor approach and Chern-Simons theory.

Contribution

It introduces the chiral spin liquid as a ground state in the topological Hubbard model with intermediate coupling, highlighting its anyon excitations and topological properties.

Findings

Chiral spin liquid exists in the intermediate coupling regime.

Chiral spin liquid may be the ground state of the model.

Low energy physics is described by Chern-Simons gauge theory.

Abstract

In this paper, we investigate the topological Hubbard model - the spinful Haldane model with on-site interaction on honeycomb lattice with spin rotation symmetry by using slave-rotor approach and find that chiral spin liquid exists in such a correlated electron system of the intermediate coupling region. By considering the anyon nature of excitations, chiral spin liquid may be the ground state of the topological Hubbard model. The low energy physics is basically determined by its Chern-Simons gauge theory.