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Resolving structural transitions in spherical dust clusters.

H Thomsen1, M Bonitz1

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Summary
This summary is machine-generated.

Finite Coulomb systems in traps exhibit complex melting behaviors, including radial, intrashell, and intershell melting. These transitions depend on particle number and position, offering insights for complex plasma experiments.

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Area of Science:

  • Physics
  • Condensed Matter Physics
  • Plasma Physics

Background:

  • Finite systems in confining potentials can undergo structural transitions analogous to phase transitions.
  • These systems are inhomogeneous, with melting points potentially varying by position and particle number.
  • Understanding melting in confined systems is crucial for various physical phenomena.

Purpose of the Study:

  • To investigate the structural transitions and melting phenomena in three-dimensional (3D) Coulomb systems confined within a harmonic trap.
  • To identify and characterize different types of melting, including radial, intrashell disordering, and intershell angular melting.
  • To introduce and utilize a novel melting criterion based on particle distribution functions and reduced entropy.

Main Methods:

  • Focusing on 3D Coulomb systems within a harmonic trap.
  • Analyzing spatial two- and three-particle distribution functions.
  • Employing a novel melting criterion based on reduced entropy.

Main Results:

  • Demonstrated radial melting in confined Coulomb systems.
  • Revealed the existence of intrashell disordering.
  • Identified intershell angular melting.
  • Showcased the applicability of the novel melting criterion.

Conclusions:

  • Finite Coulomb systems in harmonic traps exhibit rich and complex melting behaviors beyond simple radial melting.
  • The novel melting criterion, based on distribution functions and reduced entropy, is effective for analyzing these transitions.
  • The findings have direct implications for interpreting complex plasma experiments.