顺磁粒子在调制棘轮势中的同步输运与异步输运
Synchronous versus asynchronous transport of a paramagnetic particle in a modulated ratchet potential
摘要：
我们提出了一个相结合的实验和理论研究描述的动态制度所显示的顺磁性胶体粒子外部驱动的条纹图案的磁性石榴石薄膜。圆极化旋转磁场调制石榴石薄膜的杂散场，并产生一个平移的周期性电位，诱导粒子运动。增加的驱动频率，我们观察到一个过渡，从一个锁相运动与恒定的速度，以一个较低的速度，由于失去同步与移动电位的滑动动力学。我们解释的实验结果与分析听话的理论模型和解释的粒子动力学中存在的热噪声。该模型与实验结果吻合较好。
英文摘要：
We present a combined experimental and theoretical study describing the dynamical regimes displayed by a paramagnetic colloidal particle externally driven above a stripe-patterned magnetic garnet film. A circularly polarized rotating magnetic field modulates the stray field of the garnet film and generates a translating periodic potential which induces particle motion. Increasing the driving frequency, we observe a transition from a phase-locked motion with constant speed to a sliding dynamics characterized by a lower speed due to the loss of synchronization with the traveling potential. We explain the experimental findings with an analytically tractable theoretical model and interpret the particle dynamics in the presence of thermal noise. The model is in good quantitative agreement with the experiments.
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