We show that, for an exactly solvable quantum spin model, a discontinuity in the first
derivative of the ground-state concurrence appears in the absence of a quantum phase …

We consider a set of fully connected spin models that display first-or second-order
transitions and for which we compute the ground-state entanglement in the …

We analyze the entanglement properties of the ground state for a system of spins half
embedded in a magnetic field, mutually interacting antiferromagnetically. Contrary to the …

We develop a general theory of the relation between quantum phase transitions (QPTs)
characterized by nonanalyticities in the energy and bipartite entanglement. We derive a …

Characterizing and quantifying quantum correlations in states of many-particle systems is at
the core of a full understanding of phase transitions in matter. In this work, we continue our …

We study the pairwise entanglement close to separable ground states of a class of one-
dimensional quantum spin models. At T= 0 we find that such ground states separate regions …

We demonstrate that the global-entanglement (GE) measure defined by Meyer and Wallach
[J. Math. Phys. 43, 4273 (2002)] is maximal at the critical point for the Ising chain in a …

We introduce a framework to distinguish long-range quantum entanglement from long-range
classical correlations close to a finite temperature critical point in a quantum system. In …

In this paper, we consider some frustrated spin models for which the ground states are
known exactly. The concurrence, a measure of the amount of entanglement can be …

We derive a general relation between the nonanalyticities of the ground state energy and
those of a subclass of the multipartite generalized global entanglement (GGE) measure …