论文标题

在Q-State随机键时钟模型中订购动力学:涡流和界面的作用

Ordering kinetics in q-state random-bond clock model: Role of Vortices and Interfaces

论文作者

Chatterjee, Swarnajit, Sutradhar, Sabyasachi, Puri, Sanjay, Paul, Raja

论文摘要

在本文中,我们介绍了一项蒙特卡洛研究,该研究对未持持续的二维随机键$ q $ - 状态时钟模型(RBCM)中的相变和变形动力学进行了研究,该模型源自纯时钟模型[phys。 Rev. E 98,032109(2018)]。类似于纯时钟模型,RBCM从无序的无限温度的初始构型中淬灭时也经过两个不同的相。我们对平衡相过渡的调查确认,较高($ t_c^1 $)和下部($ t_c^2 $)相过渡温度随债券随机性强度$ε$降低。 $ε$在订购的准长范围内独立的快速淬火(qlro,$ t_c^2 <t <t_c^1 $)策略(lro,$ t <t_c^2 $)机制下,$ε$对非平衡性更高的动态进行了研究。我们报告说,相关函数和结构因子的动态缩放与$ε$无关,而存在淬火障碍的存在减慢了域的变形。 LRO和QLRO机制中的粗化动力学进一步以幂律生长为特征,并在我们的模拟时间范围内具有依赖障碍的指数。 LRO状态中的生长指数从纯粹的情况下的0.5降低到最大无序的情况下的0.22,而QLRO状态的相应变化从0.45降至0.38。我们进一步探讨了键稀释的时钟模型中的粗化动力学,在这两个模型中,与QLRO制度相比,该疾病的效果对于LRO制度的淬火更为重要。

In this article, we present a Monte Carlo study of phase transition and coarsening dynamics in the non-conserved two-dimensional random-bond $q$-state clock model (RBCM) deriving from a pure clock model [Phys. Rev. E 98, 032109 (2018)]. Akin to the pure clock model, RBCM also passes through two different phases when quenched from a disordered initial configuration representing at infinite temperature. Our investigation of the equilibrium phase transition affirms that both upper ($T_c^1$) and lower ($T_c^2$) phase transition temperatures decrease with bond randomness strength $ε$. Effect of $ε$ on the non-equilibrium coarsening dynamics is investigated following independent rapid quenches in the quasi-long range ordered (QLRO, $T_c^2 < T < T_c^1$) regime and long-range ordered (LRO, $T<T_c^2$) regime at temperature $T$. We report that the dynamical scaling of the correlation function and structure factor are independent of $ε$ and the presence of quenched disorder slows down domain coarsening. Coarsening dynamics in both LRO and QLRO regimes are further characterized by power-law growth with disorder-dependent exponents within our simulation time scales. The growth exponents in the LRO regime decreases from 0.5 in the pure case to 0.22 in the maximum disordered case, whereas the corresponding change in the QLRO regime happens from 0.45 to 0.38. We further explored the coarsening dynamics in the bond-diluted clock model and in both the models, the effect of the disorder is more significant for the quench in the LRO regime compared to the QLRO regime.

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