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arXiv 2603.18486cond-mat.dis-nn
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修改的伊辛spin玻璃模型中的相变:基于张量网络的采样方法

Phase Transitions in a Modified Ising Spin Glass Model: A Tensor-Network-based Sampling Approach

Graduate School of Arts and Sciences, The University of Tokyo(东京大学大学院人文社会系研究科);Komaba Institute for Science, The University of Tokyo(东京大学驹场科学研究所)

Takumi Oshima, Yamato Arai, Koji Hukushima

AI总结:

本文研究了修改后的Nishimori模型在二维正方形晶格中的相变,采用张量网络采样方法高效计算,发现spin玻璃和铁磁相变分离,并支持中间的Matthias-like spin玻璃相存在。

摘要:

在二维正方形晶格上,使用基于张量网络的采样方案研究了修改后的Nishimori模型(包括Kitatani考虑的模型)的相变。由于相关随机相互作用,生成键配置计算上具有挑战性。所采用的采样方法允许对键和自旋进行分层和独立采样。这种方法使得系统大小达到L=256时能够实现高精度计算。结果提供了明确的数值证据,表明spin玻璃和铁磁相变在Nishimori线上分离,支持中间Matthias-like spin玻璃相的存在。这一发现与在二维Edwards-Anderson (EA)模型中数值观察到的重新进入相变一致。此外,通过有限尺寸标度分析估计的临界指数表明,相变的 universality class 与标准独立和相同分布EA模型不同。

英文摘要:

Phase transitions in a modified Nishimori model, including the model considered by Kitatani, on a two-dimensional square lattice are investigated using a tensor-network-based sampling scheme. In this model, generating bond configurations is computationally demanding because of the correlated random interactions. The employed sampling method enables hierarchical and independent sampling of both bonds and spins. This approach allows high-precision calculations for system sizes up to $L=256$. The results provide clear numerical evidence that the spin-glass and ferromagnetic transitions are separated on the Nishimori line, supporting the existence of an intermediate Mattis-like spin-glass phase. This finding is consistent with the reentrant transition numerically observed in the two-dimensional Edwards-Anderson (EA) model. Furthermore, critical exponents estimated via finite-size-scaling analysis indicate that the universality class of the transitions differs from that of the standard independent and identically distributed EA model.

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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