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arXiv · 2609.39255

Moving against the odds with a cyclic active Brownian ratchet: current enhancement and reversal

Theo Spornhauer·Benoît Mahault·Johannes Zierenberg
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Abstract

We show that periodically modulating the self-propulsion of active particles in an asymmetric potential can both enhance rectified transport and reverse its direction, even when the propulsion speed itself never changes sign. Current enhancement results from the nonlinear response of active transport to propulsion strength, whereas current reversal emerges from the interplay between activity-induced spreading and passive relaxation. Our theoretical analysis identifies the regimes governed by these distinct rectification mechanisms and predicts the finite range of driving periods over which current reversal occurs. These results establish cyclic activity as a means of dynamically controlling rectified active transport, with potential applications to the selective sorting of active particles.

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Theo Spornhauer, Benoît Mahault, Johannes Zierenberg. 2026-09-30. Moving against the odds with a cyclic active Brownian ratchet: current enhancement and reversal. https://arxiv.org/abs/2609.39255

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