Approaching the RSOS critical points through entanglement: one model for many universalities

TL;DR

This paper analytically computes Renyi entropies for RSOS models, revealing how entanglement properties reflect the underlying conformal field theories and uncovering new insights into boundary effects and operator content.

Contribution

It provides explicit formulas for entanglement entropies in RSOS models, linking corrections to operator content and symmetries, and explores boundary condition effects on entanglement spectra.

Findings

Exact expressions for Renyi entropies in RSOS models.

Identification of unusual corrections linked to operator content.

Observation of unexpected logarithmic corrections in parafermionic cases.

Abstract

We analytically compute the Renyi entropies for the RSOS models, representing a wide class of exactly solvable models with multicritical conformal points described by unitary minimal models and $\mathbb{Z}_n$ parafermions. The exact expressions allow for an explicit comparison of the expansions around the critical points with the predictions coming from field theory. In this way it is possible to point out the nature of the so-called "unusual corrections", clarifying the link with the operator content, the role of the symmetries and the boundary conditions. By choosing different boundary conditions, we can single out the ground states as well as certain combinations of high energy states. We find that the {\it entanglement spectrum} is given by operators that are not present in the bulk Hamiltonian, although they belong to the same representation of a Virasoro Algebra. In the parafermionic case we observe unexpected logarithmic corrections.