Odd Diffusivity of Chiral Random Motion
Odd Diffusivity of Chiral Random Motion
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DOI：
10.1103/physrevlett.127.178001
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发表时间：
2021-10-22
影响因子：
8.6
通讯作者：
Mandadapu, Kranthi K.
中科院分区：
文献类型：
--
作者：
Hargus, Cory;Epstein, Jeffrey M.;Mandadapu, Kranthi K.
扩散输运的特征在于扩散率张量，其通常可以包含对称分量和反对称分量。虽然后者往往被忽视，我们得出绿色久保关系显示它是随机运动打破时间反转和宇称对称性的一般特征，遇到手性活性物质。与手性活性流体中出现的奇粘度类似，我们将这一组分称为奇扩散系数。我们展示了如何奇扩散出现在一个手性随机游走模型，并通过分子动力学模拟的被动示踪剂粒子扩散在手性活性浴的绿色久保关系的适用性。
Diffusive transport is characterized by a diffusivity tensor which may, in general, contain both a symmetric and an antisymmetric component. Although the latter is often neglected, we derive Green-Kubo relations showing it to be a general characteristic of random motion breaking time-reversal and parity symmetries, as encountered in chiral active matter. In analogy with the odd viscosity appearing in chiral active fluids, we term this component the odd diffusivity. We show how odd diffusivity emerges in a chiral random walk model, and demonstrate the applicability of the Green-Kubo relations through molecular dynamics simulations of a passive tracer particle diffusing in a chiral active bath.