论文标题
碰撞增强了奇数系统中的自扩散
Collisions enhance self-diffusion in odd-diffusive systems
论文作者
论文摘要
通常认为，颗粒的碰撞减少了自扩散系数。在这里，我们表明，在具有反对称元件的扩散张量为特征的奇数系统中，碰撞可以增强自扩散。在这些系统中，由于固有的弯曲效果，颗粒的运动得到了促进，而不是因碰撞而阻碍，导致相互滚动效应。使用几何模型，我们通过分析预测随着密度的增加来预测自扩散系数的增强。在洛伦兹力下的布朗尼颗粒的原型奇数 - 扩散体系中，这种违反直觉行为得到了证明。我们通过稀释系统中许多身体的布朗动力学模拟来验证我们的发现。
It is generally believed that collisions of particles reduce the self-diffusion coefficient. Here we show that in odd-diffusive systems, which are characterized by diffusion tensors with antisymmetric elements, collisions surprisingly can enhance the self-diffusion. In these systems, due to an inherent curving effect, the motion of particles is facilitated, instead of hindered by collisions leading to a mutual rolling effect. Using a geometric model, we analytically predict the enhancement of the self-diffusion coefficient with increasing density. This counterintuitive behaviour is demonstrated in the archetypal odd-diffusive system of Brownian particles under Lorentz force. We validate our findings by many body Brownian dynamics simulations in dilute systems.
