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Area of Science:

  • Physics
  • Soft Matter Physics
  • Statistical Mechanics

Background:

  • Systems far from equilibrium can show anomalous density fluctuations.
  • Active matter with orientational order typically displays large-scale density fluctuations.
  • Absorbing phase transitions in interacting particle systems can lead to hyperuniformity, suppressing large-scale fluctuations.

Purpose of the Study:

  • To investigate the coexistence of giant and suppressed density fluctuations in nematically ordered active systems.
  • To characterize this unusual state of matter and understand its underlying mechanisms.
  • To explore absorbing phase transitions in orientationally ordered particle systems.

Main Methods:

  • Theoretical modeling of nematically ordered active systems.
  • Numerical simulations to analyze density fluctuations.
  • Analysis of particle activity conditioned on local contacts.

Main Results:

  • Demonstrated coexistence of enhanced (large scale) and suppressed (intermediate scale) density fluctuations.
  • Identified particle activity triggered by local environment as the key mechanism.
  • Characterized a novel state of active matter with dual fluctuation properties.

Conclusions:

  • Seemingly incompatible density fluctuation phenomena can coexist in active matter.
  • Activity conditioned on local particle contacts leads to rich phenomenology.
  • Further exploration of absorbing phase transitions in ordered active systems is warranted.