Spontaneous Ferroelectric Order in a Bent-Core Smectic Liquid Crystal of Fluid Orthorhombic Layers

Reddy, R. Amaranatha; Zhu, Chenhui; Shao, Renfan; Körblová, Eva; Gong, Tao; Shen, Yongqiang; García, Edgardo; Glaser, Matthew A.; Maclennan, Joseph E.; Walba, David M.; Clark, Noel A.

doi:10.1126/science.1197248

Cited by 143 publications

(106 citation statements)

References 27 publications

(14 reference statements)

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“…In addition to the antiferroelectric Sm-AP A phase, several different polar biaxial phases such as macroscopically uniaxial Sm-AP R [17] and Sm-AP AR [18], and biaxial ferroelectric Sm-AP F [19], all in their ground states, were discovered. The common characteristic of these three phases is that they are nontilted (Sm-A-like) and possess long-range or shortrange order of the in-layer polarizations in smectic layers.…”

Section: Introductionmentioning

confidence: 99%

Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals

Sreenilayam¹,

Panarin

Vij

et al. 2013

Phys. Rev. E

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This version is available at https://strathprints.strath.ac.uk/47177/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output.PHYSICAL REVIEW E 88, 012504 (2013) Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals The fundamental parameter of the uniaxial liquid crystalline state that governs nearly all of its physical properties is the primary orientational order parameter (S) for the long axes of molecules with respect to the director. The biaxial liquid crystals (LCs) possess biaxial order parameters depending on the phase symmetry of the system. In this paper we show that in the first approximation a biaxial orthogonal smectic phase can be described by two primary order parameters: S for the long axes and C for the ordering of the short axes of molecules. The temperature dependencies of S and C are obtained by the Haller's extrapolation technique through measurements of the optical birefringence and biaxiality on a nontilted polar antiferroelectric (Sm-AP A ) phase of a homologous series of LCs built from the bent-core achiral molecules. For such a biaxial smectic phase both S and C, particularly the temperature dependency of the latter, are being experimentally determined. Results show that S in the orthogonal smectic phase composed of bent cores is higher than in Sm-A calamatic LCs and C is also significantly large.

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Section: Introductionmentioning

confidence: 99%

Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals

Sreenilayam¹,

Panarin

Vij

et al. 2013

Phys. Rev. E

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“…From an application point-of-view, a number of bent-core liquid crystals have been synthesized to exhibit the SmAPF phase: the first experimental evidence for the existence of a spontaneous ferroelectric phase with orthorhombic layers was given by Reddy et al in 2011 [20]. Recently, an optical phase modulator based on the SmAPF phase has been demonstrated [21], where the applied electric field couples to the polarization and changes the effective birefringence without affecting the director orientation.…”

Section: Orthogonal Polar Smectic Phasesmentioning

confidence: 99%

Dark conglomerate phases of bent-core liquid crystals

Nagaraj

2016

Liquid Crystals

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Spontaneous or induced chiral symmetry breaking in achiral systems is unusual and understanding the origin of such a phenomenon has been an important area of research for several years. The optically isotropic mesophases exhibited by unconventional liquid crystals are one of the most interesting systems to investigate spontaneous chiral symmetry breaking in liquid crystal mesophases formed by achiral moieties. The dark conglomerate (DC) phases are one such optically isotropic family of phases. In this paper, a detailed account of the tendency of bent-core mesogens to form a variety of polar smectic phases, the formation of DC phases due to layers deformations and the general optical, electrical, physical properties of the DC phases are given. An example of a dark conglomerate phase which exhibit distinct electro-optic properties is described with the nature of dynamics of the response and physical reasons responsible for such behaviour. The challenges and prospects of the dark conglomerate phases are discussed for their potential applications in novel devices.

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“…Recently proper antiferro- [8][9][10][11][12] and ferro-electric [13] ordering has finally been discovered in orthogonal smectic phases composed of nonchiral bent-core molecules. Orthogonal bent-core smectics are the only proper fluid ferroelectrics completely confirmed experimentally so far.…”

Section: Introductionmentioning

confidence: 99%

Molecular theory of proper ferroelectricity in bent-core liquid crystals

Osipov

Paja̧k

2014

Eur. Phys. J. E

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Abstract. Antiferro-and ferro-electric ordering has been discovered in orthogonal smectic phases composed of nonchiral bent-core molecules. These systems are the only proper fluid ferroelectrics confirmed experimentally so far. We consider a molecular theory of proper ferroelectric ordering in isotropic, nematic and smectic A phases and conclude that the delicate balance between the tendencies for local parallel and antiparallel ordering of molecular electric and steric dipoles is strongly shifted in restricted geometries. This is a reason why dipolar ordering is more likely to occur within a smectic layer. We derive model interaction potentials for polar bent-core molecules and present the results of the mean-field theory of ferroelectric ordering in the orthogonal smectic phase taking into account also the molecular biaxiality. Order parameter profiles have been calculated numerically and phase diagrams are presented which enable one to analyze the relative importance of dipole-dipole interaction and intermolecular attraction modulated by polar bent-core molecular shape.

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Spontaneous Ferroelectric Order in a Bent-Core Smectic Liquid Crystal of Fluid Orthorhombic Layers

Cited by 143 publications

References 27 publications

Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals

Biaxial order parameter in the homologous series of orthogonal bent-core smectic liquid crystals

Dark conglomerate phases of bent-core liquid crystals

Molecular theory of proper ferroelectricity in bent-core liquid crystals

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