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Freezing by heating in a driven mesoscopic system

Helbing1, Farkas, Vicsek

  • 1II. Institute of Theoretical Physics, University of Stuttgart, Pfaffenwaldring 57/III, 70550 Stuttgart, Germany and Department of Biological Physics, Eotvos University, Budapest, Pazmany Peter Setany 1A, H-1117 Hungary.

Physical Review Letters
|October 4, 2000
PubMed
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This study reveals a novel "freezing by heating" transition in a particle model. Increasing random forces paradoxically leads to a more ordered, crystallized state with higher energy.

Area of Science:

  • Statistical Mechanics
  • Condensed Matter Physics
  • Non-equilibrium Systems

Background:

  • Driven diffusive systems often exhibit complex phase transitions.
  • Understanding particle interactions and external forces is key to predicting system behavior.

Purpose of the Study:

  • To investigate a simple off-lattice model of particles driven in opposite directions with repulsive interactions.
  • To explore the emergence of novel phase transitions under external random forces.

Main Methods:

  • Simulation of particles moving on a periodic strip, off-lattice.
  • Inclusion of repulsive inter-particle potentials and random forces.
  • Analysis of system behavior as a function of fluctuation intensity.

Main Results:

Related Experiment Videos

  • Observed a new type of phase transition termed "freezing by heating."
  • Demonstrated that increasing random fluctuations can lead to a crystallized state.
  • Showcased a crystallized state with higher total energy compared to the fluid state.

Conclusions:

  • The
  • freezing by heating
  • transition is a novel phenomenon in driven particle systems.
  • Fluctuations can drive systems towards order, challenging conventional thermodynamic principles.
  • This model provides insights into continuum versions of driven diffusive systems.