An In-Depth View of the Microscopic Dynamics of Ising Spin Glasses at Fixed Temperature
An In-Depth View of the Microscopic Dynamics of Ising Spin Glasses at Fixed Temperature
复制标题
深入了解固定温度下伊辛旋转玻璃的微观动力学
DOI：
10.1007/s10955-009-9727-z
复制
发表时间：
2008
影响因子：
1.6
通讯作者：
D. Yllanes
中科院分区：
文献类型：
--
作者：
F. Belletti;A. Cruz;L. A. Fernández;A. Gordillo;M. Guidetti;A. Maiorano;F. Mantovani;E. Marinari;V. Martín;J. Monforte;A. M. Sudupe;D. Navarro;G. Parisi;S. Perez;J. Ruiz;S. Schifano;D. Sciretti;A. Tarancón;R. Tripiccione;D. Yllanes
利用专用计算机Janus，对伊辛自旋玻璃的非平衡动力学进行了11个数量级的三维跟踪。利用相干长度和相关长度的积分估计，我们可以研究动态非均质性和复制子模式的存在，并获得在临界温度以下的爱德华兹-安德森阶参数的安全边界。我们得到了与实验测定的温度相关的热磁化衰减指数很好的一致性。这个量级被观察到与更难测量的相干长度成比例，这对实验家来说是一个潜在的有用结果。能量弛豫指数与温度呈线性关系，对临界点有合理的外推。最后，我们研究了相干长度的时间增长，并比较了临界和激活动力学。
Using the special-purpose computer Janus, we follow the nonequilibrium dynamics of the Ising spin glass in three dimensions for eleven orders of magnitude. The use of integral estimators for the coherence and correlation lengths allows us to study dynamic heterogeneities and the presence of a replicon mode and to obtain safe bounds on the Edwards-Anderson order parameter below the critical temperature. We obtain good agreement with experimental determinations of the temperature-dependent decay exponents for the thermoremanent magnetization. This magnitude is observed to scale with the much harder to measure coherence length, a potentially useful result for experimentalists. The exponents for energy relaxation display a linear dependence on temperature and reasonable extrapolations to the critical point. We conclude examining the time growth of the coherence length, with a comparison of critical and activated dynamics.