In the adiabatic limit, a symmetric passive disk in a chiral active bath obeys an odd Einstein relation D⊥ = T_eff μ⊥, while rods and wedges show increasingly irreversible dynamics.
Diffusive regimes in a two-dimensional chiral fluid
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abstract
Diffusion is a fundamental aspect of transport processes in biological systems, and thus, in the development of life itself. And yet, the diffusive dynamics of active fluids with directed rotation, known as chiral fluids, has not been analyzed in detail so far. Here, we describe the diffusive regimes of a two-dimensional chiral fluid, composed in this case of a set of identical disk-shaped rotors. We found strong experimental evidence of odd diffusion. This odd diffusion emerges in the form of a two-dimensional tensor with an antisymmetric part. In particular, we show that chiral diffusion is complex, featuring transitions between super, quasi-normal, and sub diffusion, and very slowly aging. Moreover, we show that the diffusion tensor elements, including off-diagonal elements; i.e., odd diffusion coefficient, change sign according to flow vorticity. Therefore, the chiral fluid has a self regulated diffusion, controlled by its vorticity.
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cond-mat.stat-mech 1years
2024 1verdicts
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Odd dynamics of passive objects in a chiral active bath
In the adiabatic limit, a symmetric passive disk in a chiral active bath obeys an odd Einstein relation D⊥ = T_eff μ⊥, while rods and wedges show increasingly irreversible dynamics.