Non-transverse factorizing fields and entanglement in finite spin systems

cic.isFulltext true es
cic.isPeerReviewed true es
cic.lugarDesarrollo Universidad Nacional de La Plata es
cic.version info:eu-repo/semantics/acceptedVersion es 2019-05-16T14:00:33Z 2019-05-16T14:00:33Z
dc.title Non-transverse factorizing fields and entanglement in finite spin systems en
dc.type Artículo es
dcterms.abstract We determine the conditions for the existence of non-transverse factorizing magnetic fields in general spin arrays with anisotropic XY Z couplings of arbitrary range. It is first shown that a uniform maximally aligned completely separable eigenstate can exist just for fields hs parallel to a principal plane and forming four straight lines in field space, with the alignment direction different from that of hs and determined by the anisotropy. Such state always becomes a non-degenerate ground state (GS) for sufficiently strong (yet finite) fields along these lines, in both ferromagnetic (FM) and antiferromagnetic (AFM) type systems. In AFM chains, this field coexists with the nontransverse factorizing field h′ s associated with a degenerate N´eel-type separable GS, which is shown to arise at a level crossing in a finite chain. It is also demonstrated for arbitrary spin that pairwise entanglement reaches full range in the vicinity of both hs and h′ s, vanishing at hs but approaching small yet finite side-limits at h′ s, which are analytically determined. The behavior of the block entropy and entanglement spectrum in their vicinity is also analyzed. en Cerezo, M. es Rossignoli, Raúl Dante es Canosa, Norma Beatriz es
dcterms.extent 10 p. es
dcterms.identifier.other doi:10.1103/PhysRevB.92.224422 es
dcterms.identifier.url Recurso online es
dcterms.isPartOf.issue vol. 92, no. 22 es
dcterms.isPartOf.series Physical Review B es
dcterms.issued 2015-12-16
dcterms.language Inglés es
dcterms.license Attribution-NonCommercial-ShareAlike 4.0 International (BY-NC-SA 4.0) es
dcterms.subject quantum spin systems en
dcterms.subject entanglement en
dcterms.subject factorization en
dcterms.subject.materia Ciencias Físicas es
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