Thermodynamic Bethe Ansatz for the Spin-1/2 Staggered XXZ- Model

TL;DR

This paper applies the Thermodynamic Bethe Ansatz to analyze the ground state and excitations of a staggered XXZ spin-1/2 model with inhomogeneous anisotropy and spectral shift, revealing phase-dependent structures.

Contribution

It introduces a novel application of Thermodynamic Bethe Ansatz to a staggered XXZ model with inhomogeneity, detailing ground state and excitation structures.

Findings

Identification of ground state structures in different phases

Characterization of low-lying excitations

Analysis of phase transitions at zero temperature

Abstract

We develop the technique of Thermodynamic Bethe Ansatz to investigate the ground state and the spectrum in the thermodynamic limit of the staggered $XXZ$ models proposed recently as an example of integrable ladder model. This model appeared due to staggered inhomogeneity of the anisotropy parameter $\Delta$ and the staggered shift of the spectral parameter. We give the structure of ground states and lowest lying excitations in two different phases which occur at zero temperature.