Dynamic mode locking in a driven colloidal system: experiments and theory
Dynamic mode locking in a driven colloidal system: experiments and theory
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驱动胶体系统中的动态锁模:实验和理论
DOI:
10.1088/1367-2630/aa53cd
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发表时间:
2017
影响因子:
3.3
通讯作者:
R.P.A. Dullens
中科院分区:
文献类型:
--
作者:
M.P.N. Juniper;U. Zimmermann;A.V. Straube;R. Besseling;D.G.A.L. Aarts;H. Löwen;R.P.A. Dullens
In this article we examine the dynamics of a colloidal particle driven by a modulated force over a sinusoidal optical potential energy landscape. Coupling between the competing frequencies of the modulated drive and that of particle motion over the periodic landscape leads to synchronisation of particle motion into discrete modes. This synchronisation manifests as steps in the average particle velocity, with mode locked steps covering a range of average driving velocities. The amplitude and frequency dependence of the steps are considered, and compared to results from analytic theory, Langevin dynamics simulations, and dynamic density functional theory. Furthermore, the critical driving velocity is studied, and simulation used to extend the range of conditions accessible in experiments alone. Finally, state diagrams from experiment, simulation, and theory are used to show the extent of the dynamically locked modes in two dimensions, as a function of both the amplitude and frequency of the modulated drive.
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