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Multistep radial melting in small two-dimensional classical clusters.

D M Tomecka1, B Partoens, F M Peeters

  • 1Department of Physics, University of Antwerp (CMI), Groenenborgerlaan 171, 2020 Antwerp, Belgium.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 11, 2005
PubMed
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Molecular dynamics simulations reveal that in specific two-dimensional cluster configurations, local melting occurs within subshells before overall melting. This phenomenon is linked to the rotation between particle shells.

Area of Science:

  • Condensed matter physics
  • Computational physics
  • Materials science

Background:

  • Investigating the behavior of small classical two-dimensional (2D) clusters is crucial for understanding phase transitions in nanoscale systems.
  • Ringlike configurations in 2D clusters exhibit unique properties related to particle arrangement and motion.
  • Low-temperature dynamics precede macroscopic phase transitions like radial and angular melting.

Purpose of the Study:

  • To perform a molecular dynamics study on small classical 2D clusters with ringlike configurations.
  • To analyze particle motion at low temperatures, specifically before radial and angular melting.
  • To identify and explain phenomena occurring in 'magic number' cluster configurations.

Main Methods:

  • Utilized molecular dynamics simulations to model particle interactions and motion.

Related Experiment Videos

  • Focused on classical, two-dimensional cluster systems.
  • Analyzed system behavior at low temperatures to observe pre-melting dynamics.

    • Main Results:

    • Observed that in 'magic number' configurations, local radial melting occurs within subshells.
    • Demonstrated a correlation between this local melting and intershell rotation.
    • Characterized particle motion prior to the onset of bulk radial and angular melting.

    Conclusions:

    • 'Magic number' 2D clusters exhibit distinct low-temperature behavior characterized by localized melting.
    • Intershell rotation plays a key role in initiating local melting phenomena in these systems.
    • The findings provide insights into the fundamental mechanisms governing phase transitions in finite nanoscale systems.