In the traditional quantum theory, one-dimensional quantum spin models possess a
factorization surface where the ground states are fully separable and have vanishing …

We determine the conditions for the existence of nontransverse factorizing magnetic fields in
general spin arrays with anisotropic XYZ couplings of arbitrary range. It is first shown that a …

We discuss ground-state factorization schemes in spin S arrays with general quadratic
couplings under general magnetic fields, not necessarily uniform or transverse. It is shown …

Distribution of quantum entanglement is investigated for an anisotropic quantum XY model
with variable range interactions and in the presence of a uniform transverse magnetic field …

We derive a general method for determining the necessary and sufficient conditions for
exact factorization| Ψ〉=⊗ p| ψ p〉 of an eigenstate of a many-body Hamiltonian H, based on …

We examine the existence of completely separable ground states (GS) in finite spin-s arrays
with anisotropic XYZ couplings, immersed in a nonuniform magnetic field along one of the …

We have performed an analytical study of quantum-classical equivalence for quantum XY-
spin chains with arbitrary interactions to explore the classical counterpart of the factorizing …

We study the bipartite entanglement of two general classes of heterogeneous spin-($1,\frac
12$) and homogeneous spin-1 systems. By employing the spin correlation functions, we …

El objetivo general de esta tesis es examinar el comportamiento crítico y las correlaciones
cuánticas de sistemas cuánticos interactuantes-en particular de sistemas de espines-en …