Multiversality and unnecessary criticality in one dimension
Physical Review Letters American Physical Society (2023)
Reentrant condensation transition in a model of driven scalar active matter with diffusivity edge
European Physical Society Letters IOP Publishing 142:6 (2023) 67004-67004
Abstract:
The effect of a diffusivity edge is studied in a system of scalar active matter confined by a periodic potential and driven by an externally applied force. We find that this system shows qualitatively distinct stationary regimes depending on the amplitude of the driving force with respect to the potential barrier. For small driving, the diffusivity edge induces a transition to a condensed phase analogous to the Bose–Einstein-like condensation reported for the nondriven case, which is characterized by a density-independent steady state current. Conversely, large external forces lead to a qualitatively different phase diagram since in this case condensation is only possible beyond a given density threshold, while the associated transition at higher densities is found to be reentrantDefect Solutions of the Non-reciprocal Cahn-Hilliard Model: Spirals and Targets
(2023)
Phase Separation driven by Active Flows
Phys. Rev. Lett. 130, 238201 (2023)
Abstract:
We extend the continuum theories of active nematohydrodynamics to model a two-fluid mixture with separate velocity fields for each fluid component, coupled through a viscous drag. The model is used to study an active nematic fluid mixed with an isotropic fluid. We find microphase separation, and argue that this results from an interplay between active anchoring and active flows driven by concentration gradients. The results may be relevant to cell sorting and the formation of lipid rafts in cell membranes.
Phase separation driven by active flows
Physical Review Letters American Physical Society 130:23 (2023) 238201