Department of Physics and Astronomy, Wayne State University, Detroit, Michigan 48201, USA.
Phys Rev Lett. 2013 Jul 19;111(3):035501. doi: 10.1103/PhysRevLett.111.035501. Epub 2013 Jul 16.
The world of two-dimensional crystals is of great significance for the design and study of structural and functional materials with novel properties. Here we examine the mechanisms governing the formation and dynamics of these crystalline or polycrystalline states and their elastic and plastic properties by constructing a generic multimode phase field crystal model. Our results demonstrate that a system with three competing length scales can order into all five Bravais lattices, and other more complex structures including honeycomb, kagome, and other hybrid phases. In addition, nonequilibrium phase transitions are examined to illustrate the complex phase behavior described by the model. This model provides a systematic path to predict the influence of lattice symmetry on both the structure and dynamics of crystalline and defected systems.
二维晶体世界对于设计和研究具有新颖性质的结构和功能材料具有重要意义。在这里，我们通过构建一个通用的多模态相场晶体模型来研究这些晶体或多晶态的形成和动力学机制及其弹性和塑性性质。我们的结果表明，一个具有三个竞争长度尺度的系统可以有序成所有五个布拉维晶格，以及其他更复杂的结构，包括蜂窝状、 kagome 状和其他混合相。此外，还研究了非平衡相转变，以说明模型所描述的复杂相行为。该模型为预测晶格对称性对晶体和有缺陷系统的结构和动力学的影响提供了一种系统的途径。
