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Chirotactic response of microswimmers in fluids with odd viscosity

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Hosaka,  Yuto       
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Chatzittofi,  Michalis       
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Golestanian,  Ramin       
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Vilfan,  Andrej       
Department of Living Matter Physics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Hosaka, Y., Chatzittofi, M., Golestanian, R., & Vilfan, A. (2024). Chirotactic response of microswimmers in fluids with odd viscosity. Physical Review Research, 6: L032044. doi:10.1103/PhysRevResearch.6.L032044.


Cite as: https://hdl.handle.net/21.11116/0000-000F-CD88-1
Abstract
Odd viscosity is a property of chiral active fluids with broken time-reversal and parity symmetries. We show that the flow of such a fluid around a rotating axisymmetric body is exactly solvable and use this solution to determine the orientational dynamics of surface-driven microswimmers. Swimmers with a force-dipole moment exhibit precession around the axis of the odd viscosity. In addition, pushers show bimodal chirotaxis, i.e., alignment parallel or antiparallel to the axis, while pullers orbit in a plane perpendicular to it. A chiral swimmer that itself has a broken parity symmetry can exhibit unimodal chirotaxis and always align in the same direction.