驱动无序多晶固体：相和相变、动力学共存和峰效应反常
Driven Disordered Polymorphic Solids: Phases and Phase Transitions, Dynamical Coexistence and Peak Effect Anomalies
摘要：
我们研究了一个模型的脱钉和驱动的稳态相位的固体之间的三角形和正方形对称的基态之间的多晶相变调谐。这些包括钉扎状态，可能有占主导地位的三角形或正方形的相关性，塑性流动的液体状相，移动相与六角相关性，流动的三角形和正方形的状态和动态共存制度的特点是复杂的相互转换的本地正方形和三角形区域。我们将这些阶段定位在动态相图中。我们表明，我们在我们的移动六角相得到的明显的幂律取向相关性产生循环平均的取向关联函数与定性不同的行为在纵向（驱动器）和横向方向。中间共存制度表现出几个新的属性，包括大幅提高电流噪声，一个不寻常的幂律谱的电流波动和惊人的亚稳效应。这种噪声来自于分离局部正方形和三角形有序区域的界面的波动。我们证明了故障的有效的“摇动温度”的治疗在共存制度，通过显示这种摇动温度是非单调函数的驱动器在这个政权。最后，我们讨论了这些模拟的相关性，在无序混合相的II型超导体的涡旋线的峰值效应制度中看到的异常行为。我们建议，这种异常的行为是直接联系在我们的模拟中表现出的行为在动力学共存制度，从而提出了一个可能的解决方案的问题的起源峰效应异常。
英文摘要：
We study a model for the depinning and driven steady state phases of a solid tuned across a polymorphic phase transition between ground states of triangular and square symmetry. These include pinned states which may have dominantly triangular or square correlations, a plastically flowing liquid-like phase, a moving phase with hexatic correlations, flowing triangular and square states and a dynamic coexistence regime characterized by the complex interconversion of locally square and triangular regions. We locate these phases in a dynamical phase diagram. We demonstrate that the apparent power-law orientational correlations we obtain in our moving hexatic phase arise from circularly averaging an orientational correlation function with qualitatively different behaviour in the longitudinal (drive) and transverse directions. The intermediate coexistence regime exhibits several novel properties, including substantial enhancement in the current noise, an unusual power-law spectrum of current fluctuations and striking metastability effects. This noise arises from the fluctuations of the interface separating locally square and triangular ordered regions. We demonstrate the breakdown of effective ``shaking temperature'' treatments in the coexistence regime by showing that such shaking temperatures are non-monotonic functions of the drive in this regime. Finally we discuss the relevance of these simulations to the anomalous behaviour seen in the peak effect regime of vortex lines in the disordered mixed phase of type-II superconductors. We propose that this anomalous behavior is directly linked to the behavior exhibited in our simulations in the dynamical coexistence regime, thus suggesting a possible solution to the problem of the origin of peak effect anomalies.
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