Two-temperature activity induces liquid-crystal phases inaccessible in equilibrium
arXiv:2205.00667 · doi:10.1103/PhysRevE.107.024701
Abstract
In equilibrium hard-rod fluids, and in effective hard-rod descriptions of anisotropic soft-particle systems, the transition from the isotropic (I) phase to the nematic phase (N) is observed above the rod aspect ratio L/D = 3.70 as predicted by Onsager. We examine the fate of this criterion in a molecular dynamics study of a system of soft repulsive spherocylinders rendered active by coupling half the particles to a heat bath at a higher temperature than that imposed on the other half. We show that the system phase separates and self-organizes into various liquid-crystalline phases that are not observed in equilibrium for the respective aspect ratios. In particular, we find a nematic phase for L/D = 3 and a smectic phase for L/D = 2 above a critical activity.
13 pages, 15 figures
References in corpus (8)
- Meso-scale turbulence in living fluids
- Inertial effects of self-propelled particles: from active Brownian to active Langevin motion
- Small activity differences drive phase separation in active-passive polymer mixtures
- Defying the Gibbs Phase Rule: Evidence for an Entropy-Driven Quintuple Point in Colloid-Polymer Mixtures
- Active extensile stress promotes 3D director orientations and flows
- Heating leads to liquid-crystal and crystalline order in a two-temperature active fluid of rods
- Algebraic equations of state for the liquid crystalline phase behavior of hard rods
- Enhanced orientational ordering induced by active yet isotropic bath