Fluid Layered Ferroelectrics with Global C_∞v Symmetry

Area of Science:

• Materials Science
• Condensed Matter Physics
• Physical Chemistry

Background:

• Ferroelectricity in fluid materials is an unusual phenomenon.
• Conventional ferroelectric liquid crystals exist in low-symmetry phases.
• Recent discovery of ferroelectricity in high-symmetry nematic phases attracts attention.
• The mechanism and origin of ferroelectricity in these materials are poorly understood.
• Fabricating large domains of oriented spontaneous polarization in ferroelectric nematic phases is challenging.

Purpose of the Study:

• To report new fluid layered ferroelectrics with C∞v symmetry.
• To investigate the stable orientation of spontaneous polarization in these materials.
• To explore the mechanism of ferroelectricity due to dipole-dipole interactions.

Main Methods:

• Simplification of molecular structure of a known ferroelectric nematic compound.
• Characterization of the resulting fluid layered ferroelectrics.
• Analysis of spontaneous polarization stability and orientation.

Main Results:

• Discovery of new fluid layered ferroelectrics with C∞v symmetry.
• Observation of nearly complete orientation of spontaneous polarization stable under zero electric field.
• Demonstration of stable ferroelectricity despite reduced molecular dipole moment.
• Insights into ferroelectricity driven by dipole-dipole interactions in molecular assemblies.

Conclusions:

• New fluid layered ferroelectrics with high symmetry (C∞v) have been synthesized.
• These materials exhibit stable, macroscopically oriented spontaneous polarization without external fields.
• The findings provide valuable understanding of ferroelectricity mechanisms in molecular systems.
• The developed soft ferroelectrics show promise for diverse technological applications.