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07:03
Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
Published on: August 15, 2018
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Electronic ferroelectricity in molecular organic crystals
1Department of Physics, Tohoku University, Sendai 980-8578, Japan CREST, Sendai 980-8578, Japan.
Journal of Physics. Condensed Matter : an Institute of Physics Journal
|November 15, 2014
Summary
Electronic ferroelectricity in organic crystals arises from charge order without inversion symmetry. This phenomenon, observed in specific dimer-Mott insulators like κ-type BEDT-TTF salts, requires a dimer-type lattice and alternating charge alignments.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Organic Electronics
Background:
- Electronic ferroelectricity in molecular organic crystals is an emerging field.
- Charge-driven ferroelectricity relies on electronic charge order without inversion symmetry.
Purpose of the Study:
- To review the theoretical perspective of charge-driven electronic ferroelectricity in molecular organic crystals.
- To highlight the necessary conditions and prototypical examples of this phenomenon.
Main Methods:
- Theoretical analysis of electronic charge order in specific crystal structures.
- Focus on quarter-filling systems with dimer-type lattice structures and alternate electronic charge alignments.
Main Results:
- Identified dimer-type lattice structure and alternate electronic charge alignments as key conditions.
- Reviewed dielectric and magnetodielectric properties of κ-type BEDT-TTF organic salts.
- Discussed collective dipole excitation and potential superconductivity induced by polar charge fluctuation.
Conclusions:
- Charge-driven electronic ferroelectricity is achievable in specific organic systems.
- κ-type BEDT-TTF salts serve as important examples for studying this phenomenon.
- Further theoretical research can explore related properties and potential applications.
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