摘要翻译：
基于Ag原子在$Au(100)$表面的欠电位电化学沉积在给定的共存化学势($\mu_{coex}$)值处呈现出尖锐的一级相变这一事实，我们在$\mu(t)=\mu_{coex}+\mu_{o}sin(2pit/\tau)$形式的周期信号作用下，对接近共存的系统的滞后动力学行为进行了广泛的模拟，其中$\mu_{o}$和$\tau$分别为扫描的振幅和周期。对于相对较短的周期和足够小的振幅，系统在低或高Ag覆盖状态下会被捕获，记录磁滞回线可以证明这一点。这种情况被定义为动态有序态(DOS)，使得相应亚稳态的弛豫时间$(\tau_{relax}）服从$\tau_{relax}>\tau$。另一方面，通过适当地增加$\mu_{o}$或/和$\tau$,我们发现$ag$复盖率温和地跟随外部驱动（这里是$\tau_{relax}<\tau$)，系统进入动态无序状态(DDS)，其中滞环显示几乎对称的极限循环。用DOS和DDS之间的（不平衡）动态相变的概念讨论了由外部信号驱动的极限环之间的对称性破缺，类似于当磁系统置于可变的外部磁场中时所遇到的对称性破缺。然而，仔细的有限尺寸标度研究表明，至少在$T=300K$时，$Ag/Au(100)$体系并不表现出真正的二级相变，而是态间的交叉行为。得到并讨论了在$\mu$与$\tau$平面上有序态与无序态的位置关系图。
---
英文标题：
《Dynamic response of Ag monolayers adsorbed on Au(100) upon an
  oscillatory variation of the chemical potential: A Monte Carlo simulation
  study》
---
作者：
M. Cecilia Gimenez and Ezequiel V. Albano
---
最新提交年份：
2007
---
分类信息：

一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
--
一级分类：Physics        物理学
二级分类：Materials Science        材料科学
分类描述：Techniques, synthesis, characterization, structure.  Structural phase transitions, mechanical properties, phonons. Defects, adsorbates, interfaces
技术，合成，表征，结构。结构相变，力学性质，声子。缺陷，吸附质，界面
--

---
英文摘要：
  Based on the fact that the underpotential electrochemical deposition of Ag atoms on the $Au(100)$ surface exhibits sharp first-order phase transitions at well-defined values of the (coexistence) chemical potential ($\mu_{coex}$), we performed extensive simulations aimed at investigating the hysteretic dynamic behavior of the system close to coexistence upon the application of a periodic signal of the form $\mu(t) = \mu_{coex} + \mu_{o}sin(2\Pi t/\tau) $, where $\mu_{o}$ and $\tau$ are the amplitude and the period of the sweep, respectively. For relatively short periods and small enough amplitudes the system becomes trapped either at low or high Ag coverage states, as evidenced by recording hysteresis loops. This scenario is identified as dynamically ordered states (DOS), such that the relaxation time $(\tau_{relax})$ of the corresponding metastable state obeys $\tau_{relax} > \tau $. On the other hand, by properly increasing $\mu_{o}$ or/and $\tau$, one finds that the $Ag$ coverage gently follows the external drive (here $\tau_{relax} < \tau $) and the system is said to enter into dynamically disordered states (DDS), where hysteresis loops show almost symmetric limiting cycles. This symmetry breaking between limiting cycles driven by an external signal is discussed in terms of the concept of (out-of-equilibrium) Dynamic Phase Transitions between DOS and DDS, similar to those encountered when a magnetic system is placed in the presence of a variable external magnetic field. However, a careful finite-size scaling study reveals that, at least at $T = 300K$, the $Ag/Au(100)$ system does not exhibit true second-order phase transitions but rather a crossover behavior between states. A diagram showing the location of the ordered and disordered states in the $\mu$ versus $\tau$ plane is obtained and discussed.
---
PDF链接：
https://arxiv.org/pdf/705.447