arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.11977cond-mat.dis-nncond-mat.stat-mech
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自旋玻璃的Sherrington-Kirkpatrick模型:一种新的求解方法

The Sherrington-Kirkpatrick model for spin glasses: A new approach for the solution

C. D. Rodríguez-Camargo, E. A. Mojica-Nava, N. F. Svaiter

摘要:

本文用分布ζ函数方法(DZFM)讨论了自旋玻璃的Sherrington-Kirkpatrick平均场模型。在DZFM中,由于对平均自由能的主要贡献被写为模型的配分函数的一系列矩,因此得到了自旋玻璃多通道结构。给出了各谷点对应的鞍点的精确表达式和一个全局临界温度,表明存在多个稳定或至少可稳定的平衡态。在临界点附近,我们得到了与唯象结果一致的序参量的解析表达式。我们评估的线性和非线性极化率,我们发现预期的奇异行为在自旋玻璃临界温度。此外,我们得到了一个正定表达式的熵,我们表明,基态熵趋于零的温度为零。我们表明,我们的解决方案是稳定的每一项的扩展。最后,我们分析了重叠分布的行为,在那里我们找到了配分函数的每个时刻的一般表达式。

英文摘要:

We discuss the Sherrington-Kirkpatrick mean-field version of a spin glass within the distributional zeta-function method (DZFM). In the DZFM, since the dominant contribution to the average free energy is written as a series of moments of the partition function of the model, the spin-glass multivalley structure is obtained. Also, an exact expression for the saddle points corresponding to each valley and a global critical temperature showing the existence of many stables or at least metastables equilibrium states is presented. Near the critical point we obtain analytical expressions of the order parameters that are in agreement with phenomenological results. We evaluate the linear and nonlinear susceptibility and we find the expected singular behavior at the spin-glass critical temperature. Furthermore, we obtain a positive definite expression for the entropy and we show that ground-state entropy tends to zero as the temperature goes to zero. We show that our solution is stable for each term in the expansion. Finally, we analyze the behavior of the overlap distribution, where we find a general expression for each moment of the partition function.

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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