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Kinetic decoupling in electron-beam-driven dusty plasma: Microscopic randomization coexisting with collective flow

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Area of Science:

  • Plasma Physics
  • Condensed Matter Physics
  • Statistical Mechanics

Background:

  • Nonequilibrium systems exhibit coupled microscopic and collective dynamics.
  • Energy injection and dissipation typically synchronize these behaviors.

Purpose of the Study:

  • To investigate the breakdown of coupled evolution in driven systems.
  • To identify and characterize a
  • kinetic decoupling
  • regime.

Main Methods:

  • Experimental observations in electron-beam-driven dusty plasma.
  • Analysis of microscopic velocity randomization and collective flow fluctuations.
  • Dual-entropy framework to quantify scale separation.

Main Results:

  • A critical threshold was identified where microscopic and collective entropies diverge.
  • An
  • entropic scissors
  • effect was observed: maximum velocity randomization and suppressed flow fluctuations.
  • A stable, ergodic, thermal-like fluid state emerged with local mixing and global transport stability.

Conclusions:

  • Timescale separation between energy injection and dissipation drives kinetic decoupling.
  • The dual-entropy framework offers a model-independent diagnostic for emergent scale separation.
  • Findings are applicable to diverse driven many-body systems.