Show simple item record 2019-05-09T12:39:17Z 2019-05-09T12:39:17Z
dc.title Entanglement and coherence in a spin-s XXZ system under non-uniform fields en
dc.type Artículo es
dcterms.abstract We investigate entanglement and coherence in an XXZ spin-s pair immersed in a non-uniform transverse magnetic field. The ground state and thermal entanglement phase diagrams are analyzed in detail in both the ferromagnetic and antiferromagnetic cases. It is shown that a non-uniform field enables to control the energy levels and the entanglement of the corresponding eigenstates, making it possible to entangle the system for any value of the exchange couplings, both at zero and finite temperatures. Moreover, the limit temperature for entanglement is shown to depend only on the difference |h1 − h2| between the fields applied at each spin, leading for T > 0 to a separability stripe in the (h1, h2) field plane such that the system becomes entangled above a threshold value of |h1 − h2|. These results are demonstrated to be rigorously valid for any spin s. On the other hand, the relative entropy of coherence in the standard basis, which coincides with the ground state entanglement entropy at T = 0 for any s, becomes non-zero for any value of the fields at T > 0, decreasing uniformly for sufficiently high T . A special critical point arising at T = 0 for nonuniform fields in the ferromagnetic case is also discussed. en
dcterms.extent 18 p. es
dcterms.issued 2017-04-07
dcterms.language Inglés es
dcterms.license Attribution-NonCommercial-ShareAlike 4.0 International (BY-NC-SA 4.0) es
dcterms.subject quantum entanglement en
dcterms.subject quantum coherence en
dcterms.subject quantum spin systems en
cic.version info:eu-repo/semantics/publishedVersion es Ríos, E. es Rossignoli, Raúl Dante es Canosa, N. es
cic.lugarDesarrollo Universidad Tecnológica Nacional es
cic.lugarDesarrollo Universidad Nacional de La Plata es
dcterms.subject.materia Ciencias Físicas es
dcterms.identifier.url Recurso online es
dcterms.identifier.other doi:10.1088/1361-6455/aa66c3 es
dcterms.isPartOf.issue vol. 50, no. 9 es
dcterms.isPartOf.series Journal of Physics B: Atomic, Molecular and Optical Physics es
cic.isPeerReviewed true es
cic.isFulltext true es


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