论文标题
在一维电位中冻结软核流体：锁定相位的外观
Freezing of a soft-core fluid in a one-dimensional potential: Appearance of a locked smectic phase
论文作者
论文摘要
我们研究了沿着一个空间方向定期变化的二维胶体模型系统的二维胶体模型系统。我们的计算基于通过超柔软电位相互作用的粒子系统的平均场密度功能理论，即具有索引四（\ Mbox {GEM-4}）的广义指数模型。对于合适的底物周期性（具有相当性参数$ p = 2 $），我们发现了从调制液体到锁定的近晶液，然后再到锁定的浮动固相的一系列相变。锁定近晶相的出现与早期的理论预测和实验在结构化表面上冻结更令人反感的系统（$ p = 2 $）一致。但是，当前的超柔软系统不会显示重入融化。我们在这里研究了不同阶段的密度分布的细节，从而补充了$ p = 1 $ [PHYS的GEM-4系统上的早期工作。 Rev. E \ textbf {101}，012609（2020）]。有趣的是，可以通过不同的路径触发观察到的相变的连续性，这些路径可以改变物理控制参数。
We investigate the phase behaviour of a two-dimensional colloidal model system of ultra-soft particles on a substrate which varies periodically along one spatial direction. Our calculations are based on mean-field density functional theory for a system of particles interacting via an ultra-soft potential, that is, the generalized exponential model with index four (\mbox{GEM-4}). For suitable substrate periodicities (with commensurability parameter $p=2$), we find a succession of phase transitions from a modulated liquid to a locked smectic and then to a locked floating solid phase. The appearance of a locked smectic phase is consistent with earlier theoretical predictions and experiments for freezing of more repulsive systems on structured surfaces (with $p=2$). However, the present ultra-soft system does not display re-entrant melting. We here investigate the details of the density distributions of the different phases, thereby supplementing earlier work on GEM-4 systems with $p=1$ [Phys. Rev. E \textbf{101}, 012609 (2020)]. Interestingly, the observed succession of phase transitions can be triggered through different paths along which physical control parameters are changed.
