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arXiv 2407.19403cond-mat.dis-nncond-mat.stat-mech
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准一维受限 $\pm J$ Ising 自旋玻璃中的 Griffiths 奇异性

Griffiths singularity in quasi-one dimensional restricted $\pm J$ Ising spin glass

Fateme Izadi, Reza Sepehrinia

AI总结:

本文利用转移矩阵方法研究了准一维受限±J Ising自旋玻璃在均匀磁场中的基态能量与磁化强度,发现零场极限下磁化强度趋于非零值且存在本质奇异的Griffiths奇异性,推导了热力学量中该奇异性的显式形式,并通过数值方法验证了解析结果。

摘要:

我们使用转移矩阵方法获得了均匀磁场中准一维受限 $\pm J$ Ising 自旋玻璃的精确基态能量。磁场依赖性使我们能够推导出磁化强度作为浓度和磁场的函数。结果表明,在零场极限下,磁化强度趋于一个非零值,且对磁场具有奇异的依赖关系。我们推导了热力学量中奇异性的显式形式,如能量 $E\simeq E_0+m_0 h + E_1e^{-h_0/h}$,这是一种被称为 Griffiths 奇异性的本质奇异性。我们使用基于能量迭代方程的数值方法验证了我们的解析结果。

英文摘要:

We obtain the exact ground state energy of the quasi-one dimensional restricted $\pm J$ Ising spin glass in a uniform magnetic field using the transfer matrix method. Magnetic field dependence allows us to derive the magnetization as a function of concentration and magnetic field. It turns out that, in the limit of zero field, the magnetization tends to a nonzero value with a singular dependence on the magnetic field. We derive the explicit form of the singularity in thermodynamic quantities such as energy $E\simeq E_0+m_0 h + E_1e^{-h_0/h}$, which is an essential singularity known as Griffiths singularity. We confirm our analytical results using the numerical approach based on iterative equations for energy.

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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