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arXiv 1202.5593cond-mat.dis-nncond-mat.stat-mech
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无时间反演对称性的自旋玻璃的热力学玻璃转变

Thermodynamic glass transition in a spin glass without time-reversal symmetry

Janus Collaboration, R. A. Baños, A. Cruz, L. A. Fernandez, J. M. Gil-Narvion, A. Gordillo-Guerrero, M. Guidetti, D. Iñiguez, A. Maiorano, E. Marinari, V. Marti… 展开作者

Janus Collaboration, R. A. Baños, A. Cruz, L. A. Fernandez, J. M. Gil-Narvion, A. Gordillo-Guerrero, M. Guidetti, D. Iñiguez, A. Maiorano, E. Marinari, V. Martin-Mayor, J. Monforte-Garcia, A. Muñoz Sudupe, D. Navarro, G. Parisi, S. Perez-Gaviro, J. J. Ruiz-Lorenzo, S. F. Schifano, B. Seoane, A. Tarancon, P. Tellez, R. Tripiccione, D. Yllanes

摘要:

自旋玻璃是一个长期存在的模型缓慢的动力学出现在玻璃化转变。然而,自旋玻璃与结构玻璃的一个关键功能:不同之处在于它们具有时间反演对称性。这种对称性可以通过外加磁场而被打破,但令人遗憾的是,人们对自旋玻璃在磁场中的临界行为知之甚少。在这方面,空间方面至关重要。模拟更容易在大量维度中解释,但是必须在上临界维度以下工作(即,d<6),以便结果与实验相关。在这里,我们显示了确凿的证据,在一个领域的四维自旋玻璃的相变的存在。取得这一成就有两个关键因素:在雅努斯专用计算机上进行了大量的数值模拟,以及一种新的强大的有限尺寸标度方法。

英文摘要:

Spin glasses are a longstanding model for the sluggish dynamics that appears at the glass transition. However, spin glasses differ from structural glasses for a crucial feature: they enjoy a time reversal symmetry. This symmetry can be broken by applying an external magnetic field, but embarrassingly little is known about the critical behaviour of a spin glass in a field. In this context, the space dimension is crucial. Simulations are easier to interpret in a large number of dimensions, but one must work below the upper critical dimension (i.e., in d<6) in order for results to have relevance for experiments. Here we show conclusive evidence for the presence of a phase transition in a four-dimensional spin glass in a field. Two ingredients were crucial for this achievement: massive numerical simulations were carried out on the Janus special-purpose computer, and a new and powerful finite-size scaling method.

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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