Chirality and odd mechanics in active columnar phases - Laboratoire Jean Perrin
Article Dans Une Revue PNAS Nexus Année : 2024

Chirality and odd mechanics in active columnar phases

Résumé

Abstract Chiral active materials display odd dynamical effects in both their elastic and viscous responses. We show that the most symmetric mesophase with 2D odd elasticity in three dimensions is chiral, polar, and columnar, with 2D translational order in the plane perpendicular to the columns and no elastic restoring force for their relative sliding. We derive its hydrodynamic equations from those of a chiral active variant of model H. The most striking prediction of the odd dynamics is two distinct types of column oscillation whose frequencies do not vanish at zero wavenumber. In addition, activity leads to a buckling instability coming from the generic force-dipole active stress analogous to the mechanical Helfrich–Hurault instability in passive materials, while the chiral torque-dipole active stress fundamentally modifies the instability by the selection of helical column undulations.
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hal-04800822 , version 1 (24-11-2024)

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S J Kole, Gareth P Alexander, Ananyo Maitra, Sriram Ramaswamy. Chirality and odd mechanics in active columnar phases. PNAS Nexus, 2024, 3 (10), ⟨10.1093/pnasnexus/pgae398⟩. ⟨hal-04800822⟩

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