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Orbital magnetism of an active particle in viscoelastic suspension
Physical Review E ( IF 2.2 ) Pub Date : 2021-09-27 , DOI: 10.1103/physreve.104.034613 M Muhsin 1 , M Sahoo , Arnab Saha 2
Physical Review E ( IF 2.2 ) Pub Date : 2021-09-27 , DOI: 10.1103/physreve.104.034613 M Muhsin 1 , M Sahoo , Arnab Saha 2
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We consider an active (self-propelling) particle in a viscoelastic fluid. The particle is charged and constrained to move in a two-dimensional harmonic trap. Its dynamics is coupled to a constant magnetic field applied perpendicular to its plane of motion via Lorentz force. Due to the finite activity, the generalized fluctuation-dissipation relation (GFDR) breaks down, driving the system away from equilibrium. While breaking GFDR, we have shown that the system can have finite classical orbital magnetism only when the dynamics of the system contains finite inertia. The orbital magnetic moment has been calculated exactly. Remarkably, we find that when the elastic dissipation timescale of the medium is larger (smaller) than the persistence timescale of the self-propelling particle, it is diamagnetic (paramagnetic). Therefore, for a given strength of the magnetic field, the system undergoes a transition from diamagnetic to paramagnetic state (and vice versa) simply by tuning the timescales of underlying physical processes, such as active fluctuations and viscoelastic dissipation. Interestingly, we also find that the magnetic moment, which vanishes at equilibrium, behaves nonmonotonically with respect to increasing persistence of self-propulsion, which drives the system out of equilibrium.
中文翻译：
粘弹性悬浮液中活性粒子的轨道磁性
我们考虑粘弹性流体中的活性（自推进）粒子。粒子带电并被限制在二维谐波陷阱中移动。它的动力学与通过洛伦兹力垂直于其运动平面施加的恒定磁场耦合。由于活动有限，广义涨落-耗散关系（GFDR）失效，驱使系统远离平衡。在打破 GFDR 的同时，我们已经证明，只有当系统的动力学包含有限惯性时，系统才能具有有限的经典轨道磁性。轨道磁矩已被精确计算。值得注意的是，我们发现当介质的弹性耗散时间尺度大于（小于）自推进粒子的持续时间尺度时，它是抗磁性的（顺磁性）。所以，对于给定的磁场强度，系统只需通过调整潜在物理过程（例如主动波动和粘弹性耗散）的时间尺度，即可从抗磁性状态转变为顺磁性状态（反之亦然）。有趣的是，我们还发现在平衡时消失的磁矩随着自推进的持续性增加而非单调地表现出来，从而使系统脱离平衡。
更新日期：2021-09-28
中文翻译：
粘弹性悬浮液中活性粒子的轨道磁性
我们考虑粘弹性流体中的活性（自推进）粒子。粒子带电并被限制在二维谐波陷阱中移动。它的动力学与通过洛伦兹力垂直于其运动平面施加的恒定磁场耦合。由于活动有限，广义涨落-耗散关系（GFDR）失效，驱使系统远离平衡。在打破 GFDR 的同时，我们已经证明，只有当系统的动力学包含有限惯性时，系统才能具有有限的经典轨道磁性。轨道磁矩已被精确计算。值得注意的是，我们发现当介质的弹性耗散时间尺度大于（小于）自推进粒子的持续时间尺度时，它是抗磁性的（顺磁性）。所以，对于给定的磁场强度，系统只需通过调整潜在物理过程（例如主动波动和粘弹性耗散）的时间尺度，即可从抗磁性状态转变为顺磁性状态（反之亦然）。有趣的是，我们还发现在平衡时消失的磁矩随着自推进的持续性增加而非单调地表现出来，从而使系统脱离平衡。
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