Arrested coarsening and large density fluctuations in driven particle mixtures in two dimensions
Arrested coarsening and large density fluctuations in driven particle mixtures in two dimensions
复制标题
二维驱动粒子混合物中的粗化和大密度波动得到抑制
DOI：
10.1088/1367-2630/acb794
复制
发表时间：
2023
影响因子：
3.3
通讯作者：
Carrillo, Jan-Michael Y.
中科院分区：
文献类型：
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作者：
Lavrentovich, Maxim O.;Bolmatov, Dima;Carrillo, Jan-Michael Y.
利用分子动力学模拟，我们研究了一种被驱动的、非加性的球形粒子的二元混合物，这种混合物被限制在二维空间中运动，并浸入由点粒子组成的具有纯排斥相互作用的显式溶剂中。我们表明，在没有驱动的情况下，球形颗粒的混合物相分离和粗化，动力学符合伊辛类守恒动力学。相反，当应用驱动时，粗化被阻止，系统产生较大的密度波动。我们表明，驱动器创建一个特征尺寸的域，随着力的增加而减小。此外，我们发现这些域是各向异性的，可以平行或垂直于驱动方向。最后，我们将我们的发现与现有的强驱动体系理论联系起来，指出引入显式溶剂粒子以打破体系的伽利略不变性的重要性。
Using molecular dynamics simulations, we study a driven, nonadditive binary mixture of spherical particles confined to move in two dimensions and immersed in an explicit solvent consisting of point particles with purely repulsive interactions. We show that, without a drive, the mixture of spherical particles phase separates and coarsens with kinetics consistent with an Ising-like conserved dynamics. Conversely, when the drive is applied, the coarsening is arrested and the system develops large density fluctuations. We show that the drive creates domains of a characteristic size which decreases with an increasing force. Furthermore, we find that these domains are anisotropic and can be oriented either parallel or perpendicular to the drive direction. Finally, we connect our findings to existing theories of strongly-driven systems, pointing out the importance of introducing the explicit solvent particles to break the Galilean invariance of the system.