Entanglement in a spin system with inverse square statistical interaction

TL;DR

This paper analyzes the entanglement properties of the Haldane-Shastry spin chain with inverse square interaction, revealing how quantum correlations relate to spinon condensation at saturation field.

Contribution

It explicitly constructs the ground state of the Haldane-Shastry model under a magnetic field and studies its entanglement behavior at finite and infinite sizes.

Findings

Entanglement varies with system size and magnetic field.

Quantum correlations are linked to spinon condensation.

Ground state entanglement behavior is characterized at zero temperature.

Abstract

We investigate the entanglement content of the ground state of a system characterized by effective elementary degrees of freedom with fractional statistics. To this end, we explicitly construct the ground state for a chain of $N$ spins with inverse square interaction (the Haldane-Shastry model) in the presence of an external uniform magnetic field. For such a system at zero temperature, we evaluate the entanglement in the ground state both at finite size and in the thermodynamic limit. We relate the behavior of the quantum correlations with the spinon condensation phenomenon occurring at the saturation field.