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arXiv 1001.0741cond-mat.stat-mechcond-mat.dis-nn
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Ising铁磁体的缓慢冷却

Slow Cooling of an Ising Ferromagnet

P. L. Krapivsky

摘要:

研究了具有单自旋翻转Glauber动力学的铁磁Ising链。对于一个任意的退火协议,我们推导出一个精确的积分方程的畴壁密度。这个积分方程在极慢冷却极限下有一个渐近解。例如,我们提取了一个渐近的磁畴壁的密度在冷却过程结束时,当温度为零。慢退火通常使用Kibble-Zurek参数进行研究;在我们的设置中,此参数导致近似预测与精确渐近性非常一致。

英文摘要:

A ferromagnetic Ising chain which is endowed with a single-spin-flip Glauber dynamics is investigated. For an arbitrary annealing protocol, we derive an exact integral equation for the domain wall density. This integral equation admits an asymptotic solution in the limit of extremely slow cooling. For instance, we extract an asymptotic of the density of domain walls at the end of the cooling procedure when the temperature vanishes. Slow annealing is usually studied using a Kibble-Zurek argument; in our setting, this argument leads to approximate predictions which are in good agreement with exact asymptotics.

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