Interface Dynamics of Wet Active Systems
We study the roughening of interfaces in phase-separated active suspensions on substrates. At both large length and time scales, we show that the interfacial dynamics belongs to the |q|KPZ universality class discussed in Besse et al. [Phys. Rev. Lett. 130, 187102 (2023)PRLTAO0031-900710.1103/PhysRevLett.130.187102]. This holds despite the presence of long-ranged fluid flows. At early times, however, or for sufficiently small systems, the roughening exponents are the same as those in the presence of a momentum-conserving fluid. Surprisingly, when the effect of substrate friction can be ignored, the interface becomes random beyond a de Gennes-Taupin length scale that depends on the interfacial tension.
Authors
- Cesare Nardini (ORCID: https://orcid.org/0000-0002-0466-1418)
- Ananyo Maitra (ORCID: https://orcid.org/0000-0003-3701-6981)
- Fernando Caballero (ORCID: https://orcid.org/0000-0003-0807-2087)
Institutions
- Sorbonne Université (FR)
- Laboratoire Jean Perrin (FR)
- Service de Physique de l'État Condensé (FR)
- Laboratoire de Physique Théorique et Modélisation (FR)
- Laboratoire Médiations (FR)
- Brandeis University (US)
Publication Details
- Journal
- Physical Review Letters
- Published
- 2025-02-28
- DOI
- https://doi.org/10.1103/physrevlett.134.087105
- Citations
- 5
- Primary Topic
- Micro and Nano Robotics
- Type
- article
- Field-Weighted Citation Impact
- 6.29
Funders
- National Science Foundation
- Simons Foundation
- Isaac Newton Institute for Mathematical Sciences
- Agence Nationale de la Recherche
- Kavli Institute for Theoretical Physics, University of California, Santa Barbara