Composite Spin Liquid in Correlated Topological Insulator - Spin Liquid without Spin-Charge Separation

TL;DR

This paper introduces a novel composite spin liquid state in correlated topological insulators, characterized by topological order, composite electron excitations, and chiral edge modes, expanding the understanding of topological quantum states.

Contribution

It proposes a new type of insulator called composite spin liquid, which exhibits topological order beyond traditional spin liquids, with unique excitations and edge properties.

Findings

Identified a new composite spin liquid state with topological order.

Demonstrated the existence of composite electron excitations with spin and charge.

Showed the state supports chiral edge modes without topological degeneracy.

Abstract

In this paper, we found a new type of insulator - composite spin liquid which can be regarded as a short range B-type topological spin-density-wave. Composite spin liquid is topological ordered state beyond the classification of traditional spin liquid states. The elementary excitations are the "composite electrons" with both spin degree of freedom and charge degree of freedom, together with topological spin texture. This topological state supports chiral edge mode but no topological degeneracy.