The entanglement of the XY spin chain in a random magnetic field

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dc.creatorFujinaga, Masashi
dc.creatorHatano, Naomichi
dc.date2007-06-28
dc.date.accessioned2026-07-07T08:32:12Z
dc.date.available2026-07-07T08:32:12Z
dc.descriptionWe investigate the entanglement of the ferromagnetic XY model in a random magnetic field at zero temperature and in the uniform magnetic field at finite temperatures. We use the concurrence to quantify the entanglement. We find that, in the ferromagnetic region of the uniform magnetic field $h$, all the concurrences are \textit{generated} by the random magnetic field and by the thermal fluctuation. In one particular region of $h$, the next-nearest neighbor concurrence is generated by the random field but not at finite temperatures. We also find that the qualitative behavior of the maximum point of the entanglement in the random magnetic field depends on whether the variance of its distribution function is finite or not.
dc.description8 pages, to appear in J. Phys. Soc. Jpn
dc.identifierhttps://arxiv.org/abs/0706.4162
dc.identifierhttp://arxiv.org/abs/0706.4162
dc.identifierJ. Phys. Soc. Jpn. 76 (2007) 094001
dc.identifierdoi:10.1143/JPSJ.76.094001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/138726
dc.subjectQuantum Physics
dc.subjectDisordered Systems and Neural Networks
dc.subjectStatistical Mechanics
dc.titleThe entanglement of the XY spin chain in a random magnetic field
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