{"title":"Interface Dynamics of Wet Active Systems.","authors":"Fernando Caballero, Ananyo Maitra, Cesare Nardini","doi":"10.1103/PhysRevLett.134.087105","DOIUrl":null,"url":null,"abstract":"<p><p>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.</p>","PeriodicalId":20069,"journal":{"name":"Physical review letters","volume":"134 8","pages":"087105"},"PeriodicalIF":8.1000,"publicationDate":"2025-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical review letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/PhysRevLett.134.087105","RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
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.
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