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Emergent chirality and current generation
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DOI：10.1103/PhysRevResearch.3.043179.png)
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We investigate the phenomenon of producing vibration-induced rotational motion in a cylinder filled with achiral rods and being vibrated by an external drive. The arrangement of the rods develops chirality as a result of the interaction of gravity and steric hindrance, which is responsible for the induced motion. A two-rod arrangement is sufficient to generate a persistent motion. The average angular velocity (omega) of the rods at long times varies nonmonotonically with the packing fraction phi for a given drive strength . Though the precise nature of the variation of (omega) with phi depends on the details of the interaction between individual rods, its general characteristics hold true for rods of various materials and geometries. A stochastic model based on the asymmetric simple exclusion process helps in understanding the key features of our experiments.
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