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arXiv 2006.12249cond-mat.stat-mech
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双势阱中的欠阻尼反常动力学

Underdamped, anomalous kinetics in double-well potentials

Karol Capała, Bartłomiej Dybiec

摘要:

噪声驱动的势场中的运动是各种物理现象的原型模型。在这里,我们对比过阻尼动态与全(欠阻尼)动态。对于过阻尼粒子驱动的非平衡,$α$稳定的噪声的比例向前和向后的过渡率只取决于一个势垒的宽度分隔两个最小值。使用分析和数值方法,我们表明,在政权的全动力学,相反的过阻尼的情况下,过渡率的比例取决于宽度和高度的势垒。大量的数值模拟证实了转换率的比率的分析公式。

英文摘要:

The noise driven motion in a bistable potential acts as the archetypal model of various physical phenomena. Here, we contrast the overdamped dynamics with the full (underdamped) dynamics. For the overdamped particle driven by a non-equilibrium, $α$-stable noise the ratio of forward and backward transition rates depends only on the width of a potential barrier separating both minima. Using analytical and numerical methods, we show that in the regime of full dynamics, contrary to the overdamped case, the ratio of transition rates depends both on widths and heights of the potential barrier. The analytical formula for the ratio of transition rates is corroborated by extensive numerical simulations.

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