Localizable entanglement of isotropic antiferromagnetic spin-1/2 chain

Abstract

The bounds of entanglement on antiferromagnetic (AF) isotropic Heisenberg spin-1/2 chain including dipoledipole interaction (D) were investigated. The Quantum Monte Carlo method based on loop algorithm was employed to calculate the two-spin and single-spin expectation values mediating the lower and upper bounds. It was revealed that D and B z (the applied magnetic field) were pivotal parameters in controlling either entanglement creation/extinction or entanglement enhancement/weakening. Rival regions indicated a revival phenomenon depending on the temperature for various strengths of D which also showed a nonmonotonic behavior under certain Bz identifying critical points. Even if thermal agitations break the stability of strong D entanglement, it remains invariable at very low temperatures.

Dipole-Dipole Effect to Limits of Entanglement in Multipartite Spin Chain: A Monte Carlo Study

“…Bravo et al emphasized the significance of dipolar interactions on antiferromagnetic spin chains under transverse magnetic field stressing a quantum phase transition [46]. Previously, we have focused on a spinchain ordered as AFM considering dipolar interaction (D) and external magnetic field (B) observing rival regions related to the temperature for certain D and B values [47].…”