12 September 2013 Self-driven particles on asymmetric trap arrays
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Active matter or self driven particle systems include swimming bacteria, crawling cells and artificial swimmers. These systems often exhibit run and tumble dynamics; however, there are also examples of particles that move or swim in circles, such as bacteria near surfaces. Circular swimmers have also been experimentally realized using chiral colloidal particles. Here we examine how a substrate can be used to direct the motion of circle swimmers and separate particles with different swimming chiralities. The combination of the time reversal symmetry breaking by the circular motion as well as the breaking of detailed balance when the particles interact with the barriers leads to the directed motion. We examine this effect for different types of substrate geometries and also consider the effects of temperature. Such substrates could be created using various optical techniques.
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L. M. Lopatina, L. M. Lopatina, C. Reichhardt, C. Reichhardt, C. J. Olson Reichhardt, C. J. Olson Reichhardt, "Self-driven particles on asymmetric trap arrays", Proc. SPIE 8810, Optical Trapping and Optical Micromanipulation X, 881016 (12 September 2013); doi: 10.1117/12.2027325; https://doi.org/10.1117/12.2027325


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