# SciPost Commentary Page

### Original publication:

 Title: The folded spin-1/2 XXZ model: II. Thermodynamics and hydrodynamics with a minimal set of charges Author(s): Lenart Zadnik, Kemal Bidzhiev, Maurizio Fagotti As Contributors: Maurizio Fagotti · Lenart Zadnik Journal ref.: SciPost Physics 10, 099 DOI: https://doi.org/10.21468/SciPostPhys.10.5.099 Date: 2021-05-03

### Abstract:

We study the (dual) folded spin-1/2 XXZ model in the thermodynamic limit. We focus, in particular, on a class of local macrostates that includes Gibbs ensembles. We develop a thermodynamic Bethe Ansatz description and work out generalised hydrodynamics at the leading order. Remarkably, in the ballistic scaling limit the junction of two local macrostates results in a discontinuity in the profile of essentially any local observable.

### Lenart Zadnik  on 2021-12-21  [id 2042]

Category:
correction

The explicit form of the duality transformation in Eq. (6) on page 4 is incomplete: the transformation of $\boldsymbol{\sigma}^y_L$ is missing. Equation (6) should instead read

\boldsymbol \sigma_\ell^x\mapsto \begin{cases}
-\boldsymbol\sigma_1^y\prod_{\jmath=2}^{L-1}\boldsymbol\sigma_\jmath^z \boldsymbol \sigma_L^y\, ,&\ell=1\, ,\\
\boldsymbol\sigma_{\ell-1}^x\boldsymbol\sigma_\ell^x\, ,&\ell>1\, ,