16 September 2014 Active matter transport on complex substrates
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Colloids interacting with complex landscapes created by optical means exhibit a remarkable variety of novel orderings and equilibrium states. It is also possible to study nonequilibrium properties for colloids driven over optical traps when there is an additional external electric field or some other form of external driving. Recently a new type of colloidal system has been realized in which the colloids are self-driven or self-motile and undergo a persistent random walk. Self motile particle systems fall into the broader class of self-driven systems called active matter. For the case of externally driven colloidal particles moving over random or periodic arrangements of traps, various types of pinning or jamming effects can arise. Far less is known about the mobility of active matter particles in the presence or random or periodic substrates. For example, it is not known whether increasing the activity of the particles would reduce the jamming effects caused by effective friction between particles. Here we show by varying the activity and the density of active particles that various types of motion can arise. In some cases, increasing the self-driving leads to a reduction in the net flow of particles through the system.
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C. J. Olson Reichhardt, C. J. Olson Reichhardt, D. Ray, D. Ray, C. Reichhardt, C. Reichhardt, "Active matter transport on complex substrates", Proc. SPIE 9164, Optical Trapping and Optical Micromanipulation XI, 91641N (16 September 2014); doi: 10.1117/12.2063481; https://doi.org/10.1117/12.2063481


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