A bstract We calculate exactly the entanglement content of magnon excited states in the
integrable spin-1/2 XXX and XXZ chains in the scaling limit. In particular, we show that as far …

This study investigates the scaling behavior of the ground-state entanglement entropy in a
model of free fermions on folded cubes. An analytical expression is derived in the large …

Free Fermions on vertices of distance-regular graphs are considered. Bipartitions are
defined by taking as one part all vertices at a given distance from a reference vertex. The …

We establish a direct connection between inhomogeneous XX spin chains (or free fermion
systems with nearest-neighbors hop**) and certain QES models on the line giving rise to …

A bstract We introduce a family of inhomogeneous XX spin chains whose squared couplings
are a polynomial of degree at most four in the site index. We show how to obtain an …

We introduce a family of inhomogeneous XX spin chains whose squared couplings are a
polynomial of degree at most four in the site index. We show how to obtain an asymptotic …