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arXiv 0709.0894cond-mat.dis-nncond-mat.stat-mech
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评“Edwards-Anderson模型中的超度量”

Comment on "Ultrametricity in the Edwards-Anderson Model"

Thomas Jorg, Florent Krzakala

摘要:

在最近的一封有趣的信中,康图奇{ \it et al.}已经研究了三维(3d)Edwards-Anderson(EA)Ising自旋玻璃的若干性质。他们声称已经找到了强有力的数值证据,证明存在一个复杂的超度量结构,类似于平均场模型的复本对称性破缺解所描述的结构。通过数值模拟,我们证明了Contucci { \it et al.}作为三维EA模型中的超度量结构的证据,在二维EA模型中得到了类似的精度,二维EA模型由液滴图像很好地描述,并且在有限温度下没有自旋玻璃相。我们得出结论,在Contucci { \it et al.}信不足以排除这种可能性,例如,液滴模型可以描述3dEA模型的行为。

英文摘要:

In a recent interesting Letter Contucci {\it et al.} have investigated several properties of the three-dimensional (3d) Edwards-Anderson (EA) Ising spin glass. They claim to have found strong numerical evidence for the presence of a complex ultrametric structure similar to the one described by the replica symmetry breaking solution of the mean field model. We illustrate by numerical simulations that the relations used by Contucci {\it et al.} as evidence for an ultrametric structure in the 3d EA model are fulfilled to similar accuracy in the two-dimensional EA model, which is well-described by the droplet picture and has no spin glass phase at finite temperature. We conclude that the data presented in the Contucci {\it et al.} Letter is not sufficient to dismiss the possibility that, e.g., the droplet model might describe the behavior of the 3d EA model.

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