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Structural arrest in an ideal gas.

Willem van Ketel1, Chinmay Das, Daan Frenkel

  • 1FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.

Physical Review Letters
|May 21, 2005
PubMed
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This study reveals that a simple model system, despite having ideal gas static properties, exhibits complex "glassy" dynamics at high densities. This structural arrest occurs without any physical structure, challenging standard theories.

Area of Science:

  • Physics
  • Materials Science
  • Computational Chemistry

Background:

  • Understanding the transition from simple gas-like behavior to complex glassy dynamics is crucial in condensed matter physics.
  • Standard theories often rely on system structure to explain dynamic arrest, but this model lacks inherent structure.

Purpose of the Study:

  • To investigate the emergence of glassy dynamics in a structureless model system.
  • To explore the limitations of current theories like mode-coupling theory in explaining such phenomena.

Main Methods:

  • Utilized molecular dynamics simulations to study a model system of three-rod molecules.
  • Analyzed static properties and single-particle diffusivity at high number densities.

Main Results:

Related Experiment Videos

  • The model system displays ideal gas static properties but exhibits "glassy" dynamics at high densities.
  • Single-particle diffusivity approaches zero at high densities (NL(3)/V>>1).
  • Incoherent intermediate scattering functions collapse onto wave-vector-dependent master curves.

Conclusions:

  • Glassy dynamics and structural arrest can emerge in systems lacking physical structure.
  • The observed dynamics share similarities with mode-coupling-like behavior, despite the model's simplicity and lack of structure.