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Abstract <p>We report the experimental observation of a two-stage transition in a monolayer of active colloidal particles in plasma. Analysis of pair and orientational correlation functions reveals a transition in a particle monolayer from a crystalline state to a hexatic state and subsequently to an isotropic liquid state, which is fully consistent with Berezinskii‒Kosterlitz‒Thouless transition theory. In our experiments, an active two-dimensional structure far from thermodynamic equilibrium exhibits behavior similar to that of systems in thermodynamic equilibrium.</p>

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Structures of Active Brownian Particles in a Laser-Irradiated Colloidal Plasma Monolayer

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • D. A. Zamorin,
  • R. A. Syrovatka,
  • K. G. Koss,
  • M. M. Vasiliev,
  • O. F. Petrov

摘要

Abstract

We report the experimental observation of a two-stage transition in a monolayer of active colloidal particles in plasma. Analysis of pair and orientational correlation functions reveals a transition in a particle monolayer from a crystalline state to a hexatic state and subsequently to an isotropic liquid state, which is fully consistent with Berezinskii‒Kosterlitz‒Thouless transition theory. In our experiments, an active two-dimensional structure far from thermodynamic equilibrium exhibits behavior similar to that of systems in thermodynamic equilibrium.