Physics – Quantum Physics
Scientific paper
2007-06-28
J. Phys. Soc. Jpn. 76 (2007) 094001
Physics
Quantum Physics
8 pages, to appear in J. Phys. Soc. Jpn
Scientific paper
10.1143/JPSJ.76.094001
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.
Fujinaga Masashi
Hatano Naomichi
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