Staggered magnetization and entanglement enhancement by magnetic impurities in $S=1/2$ spin chain

Abstract

We study the effects of a magnetic impurity on the behavior of a $S=1/2$ spin chain. At T=0, both with and without an applied uniform magnetic field, an oscillating magnetization appears, whose decay with the distance from the impurity is ruled by a power law. As a consequence, pairwise entanglement is either enhanced or quenched, depending on the distance of the spin pair with respect to the impurity and on the values of the magnetic field and the intensity of the impurity itself. This leads us to suggest that acting on such control parameters, an adiabatic manipulation of the entanglement distribution can be performed. The robustness of our results against temperature is checked, and suggestions about possible experimental applications are put forward.

arXiv comment4 pages, 8 figures

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• Persistence of entanglement in thermal states of spin systems
• Effective cutting of a quantum spin chain by bond impurities
• Quench Dynamics of Entanglement in an Opened Anisotropic Spin-1/2 Heisenberg Chain
• General conditions for the generation of long-distance entanglement
• Long-distance genuine multipartite Entanglement between Magnetic Defects in Spin Chains
• Role of external fields in enhancing long-distance entanglement at finite temperatures