Finite-size corrections of an integrable chain with alternating spins

TL;DR

This paper computes finite-size corrections for an integrable spin chain with alternating spins s=1 and s=1/2, extending previous results and analyzing different phase diagram regions.

Contribution

It provides a detailed calculation of finite-size effects in an anisotropic integrable spin chain with mixed spins, generalizing earlier conformal invariance results.

Findings

Finite-size corrections derived for two phase regions.

Ground state and excitations characterized under conformal invariance.

Results extend previous models to mixed-spin chains.

Abstract

In this paper we calculate the finite-size corrections of an anisotropic integrable spin chain, consisting of spins s=1 and s=1/2. The calculations are done in two regions of the phase diagram with respect to the two couplings $\bar{c}$ and $\tilde{c}$. In case of conformal invariance we obtain the final answer for the ground state and its lowest excitations, which generalizes earlier results.