Size effect and stability of polarized fluid phases

Area of Science:

• Statistical mechanics
• Condensed matter physics
• Computational physics

Background:

• The ferroelectric fluid phase in dipolar systems is known from simulations of up to 2000 particles.
• Theoretical and experimental studies on the stability of this phase remain inconclusive.
• Previous simulation studies have been limited in system size.

Purpose of the Study:

• To investigate the ferroelectric fluid phase in significantly larger systems (approx. 10,000 particles).
• To determine the effect of increased system size on ferroelectricity.
• To explore the stability and potential spatial arrangements within the ferroelectric fluid phase.

Main Methods:

• Large-scale numerical simulations of dipolar hard and soft spheres.
• Analysis of system behavior with an order of magnitude increase in particle number compared to prior studies.

Main Results:

• Ferroelectricity is confirmed to be unaffected by the increase in system size.
• Multiple distinct spatial arrangements of dipolar hard spheres within the ferroelectric fluid phase were identified.
• The free energies of these different spatial arrangements appear to be very similar.

Conclusions:

• The ferroelectric fluid phase remains stable even in large systems.
• The system allows for various configurations without significant energetic penalties.
• This work contributes to resolving the long-standing question of ferroelectric fluid phase stability.