Investigation of bipartite entanglement across the magnetization process of a 
highly frustrated spin-1/2 Heisenberg octahedral chain as a new paradigm of the 
localized-magnon approach

Strecka, J.; Krupnitska, O.; Richter, Johannes

doi:10.1209/0295-5075/132/30004

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Investigation of bipartite entanglement across the magnetization process of a highly frustrated spin-1/2 Heisenberg octahedral chain as a new paradigm of the localized-magnon approach

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Richter, Johannes
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Strecka, J., Krupnitska, O., & Richter, J. (2020). Investigation of bipartite entanglement across the magnetization process of a highly frustrated spin-1/2 Heisenberg octahedral chain as a new paradigm of the localized-magnon approach. EPL, 132(3): 30004. doi:10.1209/0295-5075/132/30004.

Cite as: https://hdl.handle.net/21.11116/0000-0009-409B-0

Abstract

The bipartite entanglement across the magnetization process of a highly frustrated spin-1/2 Heisenberg octahedral chain is examined within the concept of localized magnons, which enables a simple calculation of the concurrence measuring a strength of the pairwise entanglement between nearest-neighbor and next-nearest-neighbor spins from square plaquettes. A full exact diagonalization of the finite-size Heisenberg octahedral chain with up to 4 unit cells (20 spins) evidences an extraordinary high precision of the localized-magnon theory in predicting measures of the bipartite entanglement at sufficiently low temperatures. While the monomer-tetramer phase emergent at low enough magnetic fields exhibits presence (absence) of the bipartite entanglement between the nearest-neighbor (next-nearest-neighbor) spins, the magnon-crystal phase emergent below the saturation field contrarily displays identical bipartite entanglement between the nearest-neighbor and next-nearest-neighbor spins. The presented results verify a new paradigm of the localized-magnon approach concerned with a simple calculation of entanglement measures.