Odd mobility of a passive tracer in a chiral active fluid

Abstract

Chiral active fluids break both time-reversal and parity symmetry, leading to exotic transport phenomena unobservable in ordinary passive fluids. We develop a generalized Green-Kubo relation for the anomalous lift experienced by a passive tracer suspended in a two-dimensional chiral active fluid subjected to an applied force. This anomalous lift is characterized by a transport coefficient termed the odd mobility. We validate our generalized response theory using molecular dynamics simulations, and we show that the asymmetric tracer mobility may be understood mechanically in terms of asymmetric deformations of the tracer-fluid density distribution function. We show that the even and odd components of the mobility decay at different rates with tracer size, suggesting the possibility of size-based particle separation using a chiral active working fluid.

arXiv commentLetter, 6 pages, 3 figures and Supplemental Material, 4 pages, 2 figures

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Cited by in corpus (14)

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• Sampling efficiency of transverse forces in dense liquids
• Collective Hall current in chiral active fluids: Coupling of phase and mass transport through traveling bands
• The Dance of Odd-Diffusive Particles: A Fourier Approach
• Irreversible Boltzmann samplers in dense liquids: weak-coupling approximation and mode-coupling theory
• Molecular modelling of odd viscoelastic fluids
• Transverse forces and glassy liquids in infinite dimensions
• Odd viscous flow past a sphere at low but nonzero Reynolds numbers
• Stability of interlocked self-propelled dumbbell clusters
• Mesoscale simulation model for odd fluids
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