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arXiv 2207.06207cond-mat.dis-nn
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自旋玻璃中的记忆与回春效应:老化系统受多个长度尺度支配

Memory and rejuvenation in spin glasses: aging systems are ruled by more than one length scale

Janus Collaboration, M. Baity-Jesi, E. Calore, A. Cruz, L. A. Fernandez, J. M. Gil-Narvion, I. Gonzalez-Adalid Pemartin, A. Gordillo-Guerrero, D. Iñiguez, A. Ma… 展开作者

Janus Collaboration, M. Baity-Jesi, E. Calore, A. Cruz, L. A. Fernandez, J. M. Gil-Narvion, I. Gonzalez-Adalid Pemartin, A. Gordillo-Guerrero, D. Iñiguez, A. Maiorano, E. Marinari, V. Martin-Mayor, J. Moreno-Gordo, A. Muñoz-Sudupe, D. Navarro, I. Paga, G. Parisi, S. Perez-Gaviro, F. Ricci-Tersenghi, J. J. Ruiz-Lorenzo, S. F. Schifano, B. Seoane, A. Tarancon, R. Tripiccione, D. Yllanes

AI总结:

本文利用Janus II超级计算机的数值实验,首次在模拟中可靠重现自旋玻璃的记忆与回春效应,并揭示老化动力学至少由三个长度尺度共同支配,而非传统理论所强调的单一玻璃关联长度。

摘要:

非平衡自旋玻璃磁响应中的记忆与回春效应,长期以来被广泛视为实验探索超度量性与温度混沌(或许是玻璃态自由能景观中最奇异的特征)的门径。遗憾的是,尽管在实验发现记忆与回春效应之后已有二十余年的理论努力,这些效应迄今仍无法被可靠地模拟。然而,最近的三项进展使我们接受了这一挑战:第一,定制的Janus II超级计算机使得开展“数值实验”成为可能,在实验中可以从模拟中计算出与在CuMn单晶中可测量的完全相同的物理量,从而允许对模拟与实验数据进行并行分析。第二,Janus II模拟教会了我们如何比较数值长度尺度与实验长度尺度。第三,我们最近理解了温度混沌如何在老化动力学中具体显现。这三个方面都被证明对于在计算机上可靠地重现回春与记忆效应至关重要。我们的分析表明,(至少)三个不同的长度尺度在老化动力学中发挥关键作用,而几乎所有关于老化动力学的理论分析都只强调单一玻璃关联长度的存在及其关键作用。

英文摘要:

Memory and rejuvenation effects in the magnetic response of off-equilibrium spin glasses have been widely regarded as the doorway into the experimental exploration of ultrametricity and temperature chaos (maybe the most exotic features in glassy free-energy landscapes). Unfortunately, despite more than twenty years of theoretical efforts following the experimental discovery of memory and rejuvenation, these effects have thus far been impossible to simulate reliably. Yet, three recent developments convinced us to accept this challenge: first, the custom-built Janus II supercomputer makes it possible to carry out "numerical experiments" in which the very same quantities that can be measured in single crystals of CuMn are computed from the simulation, allowing for parallel analysis of the simulation/experiment data. Second, Janus II simulations have taught us how numerical and experimental length scales should be compared. Third, we have recently understood how temperature chaos materializes in aging dynamics. All three aspects have proved crucial for reliably reproducing rejuvenation and memory effects on the computer. Our analysis shows that (at least) three different length scales play a key role in aging dynamics, while essentially all theoretical analyses of the aging dynamics emphasize the presence and the crucial role of a single glassy correlation length.

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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