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arXiv 1905.09409cond-mat.stat-mechcond-mat.soft
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利用竞争相互作用推迟动力学跃迁密度

Postponing the dynamical transition density using competing interactions

Patrick Charbonneau, Joyjit Kundu

摘要:

从理论、模拟和胶体实验可知,通过非常短程吸引相互作用的致密球体系统表现出动力学再入。因此,液态可以被流化到比纯粹排斥或长程吸引的相互作用更高的密度。最近的平均场,无限维计算预测,流体的动力学逮捕可以进一步延迟添加一个较长范围的排斥贡献的短程吸引力。我们通过在三维系统中进行广泛的数值模拟来研究这一建议。我们首先找到实现致密液体状态所需的短程吸引参数,然后探索可以增强效果的额外长程排斥的参数空间。在家庭的系统研究中,没有显着的(数值精度内)延迟的动态逮捕观察超出已经实现的短程吸引力。可能的解释进行了讨论。

英文摘要:

Systems of dense spheres interacting through very short-ranged attraction are known from theory, simulations and colloidal experiments to exhibit dynamical reentrance. The liquid state can thus be fluidized to higher densities than otherwise possible with interactions that are purely repulsive or long-ranged attractive. A recent mean-field, infinite-dimensional calculation predicts that the dynamical arrest of the fluid can be further delayed by adding a longer-ranged repulsive contribution to the short-ranged attraction. We examine this proposal by performing extensive numerical simulations in a three-dimensional system. We first find the short-ranged attraction parameters necessary to achieve the densest liquid state, and then explore the parameters space for an additional longer-ranged repulsion that could enhance the effect. In the family of systems studied, no significant (within numerical accuracy) delay of the dynamical arrest is observed beyond what is already achieved by the short-ranged attraction. Possible explanations are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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