Thermal entanglement in the mixed-spin Ising-Heisenberg double sawtooth frustrated ladder

TL;DR

This study explores how cyclic four-spin exchange interactions influence thermal entanglement in a mixed spin ladder, revealing significant effects on entanglement behavior and critical points under varying magnetic fields and anisotropy.

Contribution

It introduces the analysis of cyclic four-spin exchange interactions in a mixed spin ladder and their impact on bipartite entanglement, a novel aspect in this context.

Findings

Cyclic four-spin exchange significantly affects concurrence behavior.

Critical points for entanglement vanish shift with anisotropic parameters.

Magnetic field alters entanglement properties and critical points.

Abstract

The entanglement between spin-1/2 interstitial Heisenberg dimers in the mixed spin-(1,1/2) Ising-XXZ double sawtooth ladder is investigated at low temperature. Here, we consider a cyclic four-spin exchange interaction in square plaquette of each block, and investigate the effects of this amazing interaction on the bipartite entanglement between spin-1/2 interstitial dimers. Interestingly, we observe a remarkable difference in concurrence behavior with respect to the cyclic four-spin exchange interaction and magnetic field. Also, the critical points at which the concurrence vanishes are changed versus alteration of the anisotropic parameter of the interstitial Heisenberg dimers.