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三维Ising自旋玻璃模型中老化动力学的数值研究III。温变协议中的累积记忆和“混沌”效应

Numerical Study on Aging Dynamics in the 3D Ising Spin-Glass Model. III. Cumulative Memory and `Chaos' Effects in the Temperature-Shift Protocol

Hajime Takayama, Koji Hukushima

摘要:

通过蒙特卡罗方法模拟交流极化率的异相分量,研究了三维Edwards- Anderson(EA)自旋玻璃(SG)模型中老化的温度($T$)漂移协议。对于具有小幅度的$T$ -移位($ΔT$)的过程,在$T$ -移位之前印记的记忆在$T$ -改变下被保留,并且SG短程顺序在$T$ -移位之后连续增长,我们称之为累积记忆场景。对于一个负的$T$移位过程与一个大的$ΔT$的偏离累积记忆的情况下,已被观察到的第一次在数值模拟。我们将这种现象归因于“混沌效应”,我们认为,这是从本质上不同的所谓的复兴效应后观察到的$T$ -转变。

英文摘要:

The temperature ($T$)-shift protcol of aging in the 3 dimensional (3D) Edwards- Anderson (EA) spin-glass (SG) model is studied through the out-of-phase component of the ac susceptibility simulated by the Monte Carlo method. For processes with a small magnitude of the $T$-shift, $ΔT$, the memory imprinted before the $T$-shift is preserved under the $T$-change and the SG short-range order continuously grows after the $T$-shift, which we call the cumulative memory scenario. For a negative $T$-shift process with a large $ΔT$ the deviation from the cumulative memory scenario has been observed for the first time in the numerical simulation. We attribute the phenomenon to the `chaos effect' which, we argue, is qualitatively different from the so-called rejuvenation effect observed just after the $T$-shift.

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