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arXiv 1202.0630cond-mat.dis-nn
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电子玻璃的对数弛豫与应力老化

Logarithmic relaxation and stress aging in the electron glass

J. Bergli, Y. M. Galperin

摘要:

电导的缓慢弛豫和老化是一系列材料的实验特征,这些材料统称为电子玻璃。我们报告了标准电子玻璃晶格模型的动态蒙特卡罗模拟。在非平衡态中,电子将经常形成具有高于声子浴温度的有效电子温度的费米分布。我们研究了在三种不同的情况下,作为时间的函数的有效温度:从初始随机状态淬火后的松弛,在驱动过程中由外部电场和在松弛后,这样的驱动。我们观察到对数松弛的有效温度淬火后,从一个随机的初始状态,以及驱动系统一段时间后,$t_w$与强电场。对于不太强的电场和不太长的$t_w$,我们观察到,在不同的等待时间的有效温度的数据崩溃时,作为$t/t_w$的函数绘制-所谓的简单老化。在驾驶期间,我们研究如何建立有效的温度,分离的贡献,从那些没有参与跳跃的网站。研究发现,加热主要影响的网站参与跳跃,但在强驱动,也加热其余网站。

英文摘要:

Slow relaxation and aging of the conductance are experimental features of a range of materials, which are collectively known as electron glasses. We report dynamic Monte Carlo simulations of the standard electron glass lattice model. In a non-equilibrium state, the electrons will often form a Fermi distribution with an effective electron temperature higher than the phonon bath temperature. We study the effective temperature as a function of time in three different situations: relaxation after a quench from an initial random state, during driving by an external electric field and during relaxation after such driving. We observe logarithmic relaxation of the effective temperature after a quench from a random initial state as well as after driving the system for some time $t_w$ with a strong electric field. For not too strong electric field and not too long $t_w$ we observe that data for the effective temperature at different waiting times collapse when plotted as functions of $t/t_w$ -- the so-called simple aging. During the driving period we study how the effective temperature is established, separating the contributions from the sites involved in jumps from those that were not involved. It is found that the heating mainly affects the sites involved in jumps, but at strong driving, also the remaining sites are heated.

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