论文标题
通过外部磁场强烈增强了带电的Rouse二聚体的动力学
Strongly enhanced dynamics of a charged Rouse dimer by an external magnetic field
论文作者
论文摘要
虽然在著名的Rouse模型中充分了解了粘性溶剂中的二聚体和聚合物链的动力学，但外部磁场对带电链动力学的影响却少得多。在这里，我们将带电二聚体的Rouse模型推广，以包括外部磁场的效果。我们的分析可解决的模型允许对Lorentz-Force引起的过度阻尼极限中二聚体的磁化动力学有基本的见解。令人惊讶的是，对于一个相对带电的颗粒的二聚体，我们发现了二聚体中心动力学的巨大增强，即使表现出短暂的超球行为。这在过度阻尼的系统中是非常不寻常的，因为既没有惯性，也没有任何内部或外部驾驶。我们将其归因于由于洛伦兹力而引起的显着翻译和旋转耦合。我们还发现，磁场沿其方向及其有效旋转扩散系数降低了二聚体的迁移率。原则上，我们的预测可以通过使用胶体颗粒和复杂等离子体的实验来测试。
While the dynamics of dimers and polymer chains in a viscous solvent is well understood within the celebrated Rouse model, the effect of an external magnetic field on the dynamics of a charged chain is much less understood. Here we generalize the Rouse model for a charged dimer to include the effect of an external magnetic field. Our analytically solvable model allows a fundamental insight into the magneto-generated dynamics of the dimer in the overdamped limit as induced by the Lorentz-force. Surprisingly, for a dimer of oppositely charged particles, we find an enormous enhancement of the dynamics of the dimer center which exhibits even a transient superballistic behavior. This is highly unusual in an overdamped system for there is neither inertia nor any internal or external driving. We attribute this to a significant translation and rotation coupling due to the Lorentz force. We also find that magnetic field reduces the mobility of a dimer along its orientation and its effective rotational diffusion coefficient. In principle, our predictions can be tested by experiments with colloidal particles and complex plasmas.
