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Interface Roughening in Nonequilibrium Phase-Separated Systems.

M Besse1,2, G Fausti1,3, M E Cates4

  • 1Service de Physique de l'Etat Condensé, CEA, CNRS Université Paris-Saclay, CEA-Saclay, 91191 Gif-sur-Yvette, France.

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|May 19, 2023
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Summary
This summary is machine-generated.

A new universality class, |q|KPZ, describes roughening interfaces in active phase-separated systems. This finding, confirmed by renormalization group and numerical simulations, offers insights into liquid-vapor interfaces.

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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Phase-separated systems exhibit interface roughening driven by capillary waves.
  • Existing models like Edwards-Wilkinson and Kardar-Parisi-Zhang (KPZ) do not capture the nonlocal dynamics caused by bulk fluxes.

Purpose of the Study:

  • To identify and characterize the universality class governing the dynamics of interfaces in active phase-separated systems.
  • To investigate the theoretical framework beyond detailed balance for interface dynamics.

Main Methods:

  • Derivation of effective interface dynamics from a minimal field theory of active phase separation.
  • One-loop renormalization group calculations to determine scaling exponents.
  • Numerical integration of the newly proposed |q|KPZ equation.

Main Results:

  • Identification of a novel universality class, termed |q|KPZ, for interfaces in active phase separation.
  • Computation of scaling exponents associated with the |q|KPZ universality class.
  • Validation of theoretical predictions through numerical simulations.

Conclusions:

  • The |q|KPZ universality class provides a new framework for understanding interface dynamics in systems out of equilibrium.
  • This class is relevant for describing liquid-vapor interfaces in both 2D and 3D active systems.
  • The findings extend the applicability of interface growth models to more complex, non-equilibrium phenomena.