Correlation amplitude for the XXZ spin chain in the disordered regime

TL;DR

This paper derives an analytical expression for the amplitude of the long-distance asymptotic correlation function in the disordered regime of the XXZ spin chain, advancing understanding of quantum spin systems.

Contribution

It introduces a novel analytical formula for the correlation amplitude in the disordered phase of the XXZ spin chain, which was previously not explicitly known.

Findings

Analytical expression for correlation amplitude derived

Enhanced understanding of disordered quantum spin chains

Potential applications in quantum information and condensed matter physics

Abstract

We proposed an analytical expression for the amplitude defining the long distance asymptotic of the correlation function <\sigma^z_k \sigma^z_{k+n}>.