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arXiv 1502.06336cond-mat.stat-mechcond-mat.soft
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二维约束中带电粒子的玻璃化转变

Glass transition of charged particles in two-dimensional confinement

Anoosheh Yazdi, Marco Heinen, Alexei Ivlev, Hartmut Löwen, Matthias Sperl

摘要:

用模式耦合理论研究了二维受限介观带电粒子的玻璃化转变。我们考虑两种类型的有效的粒子之间的相互作用,对应于两种不同的模型,周围的离子的分布是集成在粗粒度的描述。在第一个模型中,一个平面单层的带电粒子浸没在一个无界的各向同性浴的离子,产生各向同性屏蔽Debye-Hückel-(汤川-)型有效相互作用。第二个,实验上更相关的系统是一个带负电荷的粒子,悬浮在一个平面水平电极上,在实验室实验中经常遇到复杂的(灰尘)等离子体。一个稳定的等离子体电流对电极引起的各向异性的有效粒子之间的相互作用潜力,与代数长程面内衰减。在一个全面的参数扫描,涵盖了典型的实验等离子体条件的范围内,我们计算和比较的模式耦合预测的玻璃化转变在这两种系统。

英文摘要:

The glass transition of mesoscopic charged particles in two-dimensional confinement is studied by mode-coupling theory. We consider two types of effective interactions between the particles, corresponding to two different models for the distribution of surrounding ions that are integrated out in coarse-grained descriptions. In the first model, a planar monolayer of charged particles is immersed in an unbounded isotropic bath of ions, giving rise to an isotropically screened Debye-Hückel- (Yukawa-) type effective interaction. The second, experimentally more relevant system is a monolayer of negatively charged particles that levitate atop a flat horizontal electrode, as frequently encountered in laboratory experiments with complex (dusty) plasmas. A steady plasma current towards the electrode gives rise to an anisotropic effective interaction potential between the particles, with an algebraically long-ranged in-plane decay. In a comprehensive parameter scan that covers the typical range of experimentally accessible plasma conditions, we calculate and compare the mode-coupling predictions for the glass transition in both kinds of systems.

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