One of the best signatures of nonclassicality in a quantum system is the existence of
correlations that have no classical counterpart. Different methods for quantifying the …

Recent interest in aspects common to quantum information and condensed matter has
prompted a flurry of activity at the border of these disciplines that were far distant until a few …

We review the quantum fidelity approach to quantum phase transitions in a pedagogical
manner. We try to relate all established but scattered results on the leading term of the …

We discuss the behavior of quantum and classical pairwise correlations in critical systems,
with the quantumness of the correlations measured by the quantum discord. We analytically …

Density-functional theory (DFT) and model Hamiltonians are conceptually distinct
approaches to the many-particle problem, which can be developed and applied …

We present a numerical study of a quantum phase transition from a spin-polarized to a
topologically ordered phase in a system of spin-1∕ 2 particles on a torus. We demonstrate …

We study the quantum entanglement and quantum phase transition (QPT) of the anisotropic
spin-1/2 XY model with staggered Dzyaloshinskii-Moriya (DM) interaction by means of the …

We present two methods of calculating the spatial entanglement of an interacting electron
system within the framework of density-functional theory. These methods are tested on the …

Entanglement of the ground states in the S= 1/2 XXZ chain, dimerized Heisenberg spin
chain, two-leg spin ladders as well as S= 1 anisotropic Haldane chain is analysed using the …

The entanglement exhibits extremal or singular behavior near quantum critical points
(QCPs) in many condensed matter models. These intriguing phenomena, however, still call …