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

Thumbnail Image

Date

Authors

Journal Title

Journal ISSN

Volume Title

Publisher

Abstract

Description

We 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.
8 pages, to appear in J. Phys. Soc. Jpn

Keywords

Quantum Physics, Disordered Systems and Neural Networks, Statistical Mechanics

Citation

URI

http://salesiana.dossiersoluciones.com/handle/123456789/138726

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0706.4162
 http://arxiv.org/abs/0706.4162
 J. Phys. Soc. Jpn. 76 (2007) 094001
 doi:10.1143/JPSJ.76.094001

Collections

arXiv