arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2602.22657cond-mat.dis-nn
收藏

铁磁自旋玻璃与相关无序的精确映射

Exact mapping of a spin glass with correlated disorder to the pure Ising model

Institute of Integrated Research, Institute of Science Tokyo(东京科学大学综合研究学院);Graduate School of Information Sciences, Tohoku University(东北大学情报科学研究院);RIKEN Interdisciplinary Theoretical and Mathematical Sciences (iTHEMS)(理化学研究所交叉理论数学科学中心(iTHEMS))

Hidetoshi Nishimori

AI总结:

本文通过证明Nishimori线的存在,展示了相关无序自旋玻璃模型与纯Ising模型之间的精确映射关系,揭示了其临界行为与纯Ising模型的相似性。

摘要:

我们引入了一个具有相关无序的Ising自旋玻璃模型,该模型连续地从纯铁磁Ising模型过渡到具有对称无序的Edwards-Anderson模型。对于该模型,我们证明可以定义Nishimori线(NL),类似于Edwards-Anderson模型,在该线上,物理量可以精确地用纯Ising模型在明确的有效温度下的量来表示。例如,NL上的能量等于纯Ising模型在有效温度下的能量,仅相差一个常数和一个平凡因子。更值得注意的是,NL上的比热等于纯Ising模型在有效温度下的能量,而不是比热,同样仅相差一个常数和一个平凡因子。非不变量量如磁化率和关联函数恰好等于纯Ising模型在有效温度下的相应量。这些精确关系表明,该相关无序模型在多临界点处的主导临界行为是纯Ising-like的,与传统Edwards-Anderson模型的标准多临界普遍类不同。我们的结果激励了对自旋玻璃中无序相关性等相对较不熟悉的主题的进一步研究。

英文摘要:

We introduce an Ising spin-glass model with correlated disorder which continuously interpolates between the pure ferromagnetic Ising model and the Edwards-Anderson model with symmetric disorder. For this model, we prove that a Nishimori line (NL) can be defined, analogously to the Edwards-Anderson model, on which physical quantities can be expressed exactly in terms of those of the pure Ising model at a well-defined effective temperature on any lattice in any dimension. For example, the energy on the NL is equal to the energy of the pure Ising model at the effective temperature up to a constant and a trivial factor. More remarkably, the specific heat on the NL equals the energy, not the specific heat, of the pure Ising model at the effective temperature, again up to a constant and a trivial factor. Gauge-noninvariant quantities such as the magnetization and correlation functions are exactly equal to the corresponding quantities of the pure Ising model at the effective temperature. These exact relations imply that the leading critical behavior at that multicritical point for the disorder-correlated model is pure-Ising-like, in contrast to the conventional multicritical universality class of the standard Edwards-Anderson model. Our results motivate further investigations of the relatively unexplored topic of correlations in disorder in spin glasses and related problems.

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。

↑