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arXiv 2102.11359cond-mat.dis-nncond-mat.stat-mech
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高斯随机场随机网络中的伊辛自旋玻璃

Ising spin glass in a random network with a gaussian random field

R. Erichsen, A. Silveira, S. G. Magalhaes

摘要:

我们研究了自旋玻璃(SG)和随机场(RF)的联合存在的热力学相变,使用随机图模型,使我们能够处理的淬火无序。因此,连通性成为我们理论中的一个可控参数,使我们能够回答这种描述与平均场论之间的差异,即,完全关联理论我们考虑了随机网络随机场伊辛模型,其中自旋交换相互作用和RF都是服从高斯分布的随机变量。结果发现内副本对称(RS)近似,其稳定性是使用两个副本的方法。这也将我们的工作置于更广泛的讨论背景下,即RS稳定性作为连接性的函数。特别是,我们的研究结果表明,对于小的连接有一个区域在零温度下,RS解决方案保持稳定高于给定值的磁场,无论RF的强度。因此,我们的研究结果显示出与完全连接理论预测的RF和SG制度之间的交叉的重要差异。

英文摘要:

We investigate thermodynamic phase transitions of the joint presence of spin glass (SG) and random field (RF) using a random graph model that allows us to deal with the quenched disorder. Therefore, the connectivity becomes a controllable parameter in our theory, allowing us to answer what the differences are between this description and the mean-field theory i.e., the fully connected theory. We have considered the random network random field Ising model where the spin exchange interaction as well as the RF are random variables following a Gaussian distribution. The results were found within the replica symmetric (RS) approximation, whose stability is obtained using the two-replica method. This also puts our work in the context of a broader discussion, which is the RS stability as a function of the connectivity. In particular, our results show that for small connectivity there is a region at zero temperature where the RS solution remains stable above a given value of the magnetic field no matter the strength of RF. Consequently, our results show important differences with the crossover between the RF and SG regimes predicted by the fully connected theory.

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