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arXiv 0909.2556cond-mat.dis-nn
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低温自旋玻璃涨落:在球近似下的扩展

Low temperature spin glass fluctuations: expanding around a spherical approximation

A. Crisanti, C. De Dominicis, T. Sarlat

摘要:

零温附近的自旋玻璃行为是一个复杂的问题。为了更容易地访问的自旋玻璃序参量$Q(x)$,并在同一时间,保持跟踪$Q_{ab}$,其矩阵方面,因此的海森控制稳定性,我们调查的扩展复制的自由能功能周围的“球形”近似。这种扩展是通过引入一个约束场和一个(双)勒让德变换表示的自旋算符和约束场算符。球近似的自旋起伏处理的全局约束和勒让德变换功能的扩展使他们越来越接近伊辛本地约束。在本文中,我们研究的第一个贡献的系统改正的球形起点。

英文摘要:

The spin glass behavior near zero temperature is a complicated matter. To get an easier access to the spin glass order parameter $Q(x)$ and, at the same time, keep track of $Q_{ab}$, its matrix aspect, and hence of the Hessian controlling stability, we investigate an expansion of the replicated free energy functional around its ``spherical'' approximation. This expansion is obtained by introducing a constraint-field and a (double) Legendre Transform expressed in terms of spin correlators and constraint-field correlators. The spherical approximation has the spin fluctuations treated with a global constraint and the expansion of the Legendre Transformed functional brings them closer and closer to the Ising local constraint. In this paper we examine the first contribution of the systematic corrections to the spherical starting point.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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