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# PRE: Liquid crystals

## Recently published articles in Phys. Rev. E in the Table of Content section "Liquid crystals"

Published: 2017-11-23T00:02:06+00:00

Dielectric properties of liquid crystalline dimer mixtures exhibiting the nematic and twist-bend nematic phases

2017-11-14T10:00:00+00:00

Author(s): Nina Trbojevic, Daniel J. Read, and Mamatha Nagaraj

A detailed investigation of the thermal and dielectric properties of a series of binary mixtures exhibiting the nematic ($N$) and twist-bend nematic (${N}_{\mathrm{TB}}$) liquid crystal phases is presented. The mixtures consist of an achiral, dimeric liquid crystal CB7CB, which forms the nematic and...

[Phys. Rev. E 96, 052703] Published Tue Nov 14, 2017

Effect of polymer network on thermodynamic stability and switching behavior of the smectic-${C}_{α}^{*}$ phase

2017-11-08T10:00:00+00:00

Author(s): Magdalena Knapkiewicz, Mariola Sądej, Wojciech Kuczyński, and Adam Rachocki

A polymer-stabilized liquid crystal based on ${4}^{′}$-(octyloxy)biphenyl-4-carboxylate 2-fluoro-4-((octyl-2-yloxy)carbonyl)phenyl (D16) and 1,6 hexanediol diacrylate as a monomer was prepared by in situ photopolymerization. The selected antiferroelectric liquid crystal contains a fast-switching sme...

[Phys. Rev. E 96, 052702] Published Wed Nov 08, 2017

Electrically induced structure transition in nematic liquid crystal droplets with conical boundary conditions

2017-11-06T10:00:00+00:00

Author(s): V. Yu. Rudyak, M. N. Krakhalev, V. S. Sutormin, O. O. Prishchepa, V. Ya. Zyryanov, J.-H. Liu, A. V. Emelyanenko, and A. R. Khokhlov

Polymer-dispersed liquid crystal composites have been a focus of study for a long time for their unique electro-optical properties and manufacturing by “bottom-up” techniques at large scales. In this paper, nematic liquid crystal oblate droplets with conical boundary conditions (CBCs) under the acti...

[Phys. Rev. E 96, 052701] Published Mon Nov 06, 2017

Visual evaluation of surface anchoring strength by electrohydrodynamic convection of a nematic liquid crystal

2017-10-30T10:00:00+00:00

Author(s): Gyu Jin Choi, Jae Min Song, Chul Gyu Jhun, Jong-Hoon Huh, and Jin Seog Gwag

Visual evaluation of the surface anchoring energies in a nematic liquid crystal (LC) cell is characterized by the direction of the convection roll pattern that appears in the low-frequency conduction regime. The convection roll pattern in a twisted nematic LC (TNLC) cell is oriented perpendicular to...

[Phys. Rev. E 96, 040701(R)] Published Mon Oct 30, 2017

Observations of cavity polaritons in one-dimensional photonic crystals containing a liquid-crystalline semiconductor based on perylene bisimide units

2017-10-19T10:00:00+00:00

Author(s): T. Sakata, M. Suzuki, T. Yamamoto, S. Nakanishi, M. Funahashi, and N. Tsurumachi

We investigated the optical transmission properties of one-dimensional photonic crystal (1D-PC) microcavity structures containing the liquid-crystalline (LC) perylene tetracarboxylic bisimide (PTCBI) derivative. We fabricated the microcavity structures for this study by two different methods and obs...

[Phys. Rev. E 96, 042704] Published Thu Oct 19, 2017

Emergence of biaxial nematic phases in solutions of semiflexible dimers

2017-10-18T10:00:00+00:00

Author(s): Arvin Vaghela, Paulo I. C. Teixeira, and Eugene M. Terentjev

We investigate the isotropic, uniaxial nematic and biaxial nematic phases, and the transitions between them, for a model lyotropic mixture of flexible molecules consisting of two rigid rods connected by a spacer with variable bending stiffness. We apply density-functional theory within the Onsager a...

[Phys. Rev. E 96, 042703] Published Wed Oct 18, 2017

Topological defects in an unconfined nematic fluid induced by single and double spherical colloidal particles

2017-10-06T10:00:00+00:00

Author(s): Yiwei Wang, Pingwen Zhang, and Jeff Z. Y. Chen

We present numerical solutions to the Landau-de Gennes free-energy model under the one-constant approximation for systems of single and double spherical colloidal particles immersed in an otherwise uniformly aligned nematic liquid crystal. A perfect homeotropic surface anchoring of liquid-crystal mo...

[Phys. Rev. E 96, 042702] Published Fri Oct 06, 2017

Design and investigation of de Vries liquid crystals based on 5-phenyl-pyrimidine and (R,R)-2,3-epoxyhexoxy backbone

2017-10-03T10:00:00+00:00

Author(s): S. P. Sreenilayam, D. Rodriguez-Lojo, V. P. Panov, V. Swaminathan, J. K. Vij, Yu. P. Panarin, E. Gorecka, A. Panov, and P. J. Stevenson

Calamitic liquid crystals based on 5-phenyl-pyrimidine derivatives have been designed, synthesized, and characterized. The 5-phenyl pyrimidine core was functionalized with a chiral (R,R)-2,3-epoxyhexoxy chain on one side and either siloxane or perfluoro terminated chains on the opposite side. The on...

[Phys. Rev. E 96, 042701] Published Tue Oct 03, 2017

Time correlation functions in the Lebwohl-Lasher model of liquid crystals

2017-09-28T10:00:00+00:00

Author(s): Anoop Varghese and Patrick Ilg

Time correlation functions in the Lebwohl-Lasher model of nematic liquid crystals are studied using theory and molecular dynamics simulations. In particular, the autocorrelation functions of angular momentum and nematic director fluctuations are calculated in the long-wavelength limit. The constitut...

[Phys. Rev. E 96, 032705] Published Thu Sep 28, 2017

Modeling a photoinduced planar-to-homeotropic anchoring transition triggered by surface azobenzene units in a nematic liquid crystal

2017-09-25T10:00:00+00:00

Author(s): Patrick Oswald and Jordi Ignés-Mullol

The performance of light-controlled liquid crystal anchoring surfaces depends on the nature of the photosensitive moieties and on the concentration of spacer units. Here, we study the kinetics of photosensitive liquid crystal cells that incorporate an azobenzene-based self-assembled monolayer. We ch...

[Phys. Rev. E 96, 032704] Published Mon Sep 25, 2017

Photonic band structure of diamond colloidal crystals in a cholesteric liquid crystal

2017-09-22T10:00:00+00:00

Author(s): Setarehalsadat Changizrezaei and Colin Denniston

In this paper, we demonstrate the presence of a photonic band gap for a diamond lattice structure made of particles with normal anchoring inside a cholesteric liquid crystal. As is typical for liquid crystals (LCs), there is considerable contrast between the dielectric constant parallel ${ε}_{∥}$ an...

[Phys. Rev. E 96, 032702] Published Fri Sep 22, 2017

Complex free-energy landscapes in biaxial nematic liquid crystals and the role of repulsive interactions: A Wang-Landau study

2017-09-22T10:00:00+00:00

Author(s): B. Kamala Latha, K. P. N. Murthy, and V. S. S. Sastry

General quadratic Hamiltonian models, describing the interaction between liquid-crystal molecules (typically with ${D}_{2h}$ symmetry), take into account couplings between their uniaxial and biaxial tensors. While the attractive contributions arising from interactions between similar tensors of the ...

[Phys. Rev. E 96, 032703] Published Fri Sep 22, 2017

Electroclinic effect in chiral smectic-$A$ liquid crystal elastomers

2017-09-18T10:00:00+00:00

Author(s): Noy Cohen and Kaushik Bhattacharya

Chiral smectic-$A$ liquid crystal elastomers are rubbery materials composed of a lamellar arrangement of liquid crystalline mesogens. It has been shown experimentally that these materials shear when subjected to an electric field due to the electrically induced tilt of the director. Experiments have...

[Phys. Rev. E 96, 032701] Published Mon Sep 18, 2017

Polarization exchange of optical eigenmode pair in twisted-nematic Fabry-Pérot resonator

2017-08-29T10:00:00+00:00

Author(s): Vladimir A. Gunyakov, Ivan V. Timofeev, Mikhail N. Krakhalev, and Victor Ya. Zyryanov

The polarization exchange effect in a twisted-nematic Fabry-Pérot resonator is experimentally confirmed in the regimes of both uniform and electric-field-deformed twisted structures. The polarization of output light in the transmission peaks is shown to be linear rather than elliptical. The polariza...

[Phys. Rev. E 96, 022711] Published Tue Aug 29, 2017

Two-state model for nematic liquid crystals made of bent-core molecules

2017-08-17T10:00:00+00:00

Nematic ($N$) liquid crystals made of bent-core molecules exhibit unusual physical properties such as an intermediate phase between the $N$ and isotropic ($I$) phases, a very weak $NI$ transition as inferred from magnetic birefringence measurements in a low field, which is apparently incompatible wi...

[Phys. Rev. E 96, 022710] Published Thu Aug 17, 2017

Multiscale approach to nematic liquid crystals via statistical field theory

2017-08-15T10:00:00+00:00

Author(s): Bing-Sui Lu

We propose an approach to a multiscale problem in the theory of thermotropic uniaxial nematics based on the method of statistical field theory. This approach enables us to relate the coefficients $A$, $B$, $C$, ${L}_{1}$, and ${L}_{2}$ of the Landau-de Gennes free energy for the isotropic-nematic ph...

[Phys. Rev. E 96, 022709] Published Tue Aug 15, 2017

Elastic properties of the nematic phase in hard ellipsoids of short aspect ratio

2017-08-14T10:00:00+00:00

Author(s): S. Heymans and T. Schilling

We present a Monte Carlo simulation study of suspensions of hard ellipsoids of revolution. Based on the spatial fluctuations of the orientational order, we have computed the Frank elastic constants for prolate and oblate ellipsoids and compared them to the affine transformation model. The affine tra...

[Phys. Rev. E 96, 022708] Published Mon Aug 14, 2017

Nanoscale interfacial defect shedding in a growing nematic droplet

2017-08-11T10:00:00+00:00

Author(s): Sebastian Gurevich, Nikolas Provatas, and Alejandro Rey

Interfacial defect shedding is the most recent known mechanism for defect formation in a thermally driven isotropic-to-nematic phase transition. It manifests in nematic-isotropic interfaces going through an anchoring switch. Numerical computations in planar geometry established that a growing nemati...

[Phys. Rev. E 96, 022707] Published Fri Aug 11, 2017

Impact of ferroelectric and superparaelectric nanoparticles on phase transitions and dynamics in nematic liquid crystals

2017-08-09T10:00:00+00:00

Author(s): Szymon Starzonek, Sylwester J. Rzoska, Aleksandra Drozd-Rzoska, Krzysztof Czupryński, and Samo Kralj

Results of broadband dielectric spectroscopy (BDS) studies of pure liquid crystalline (4-pentyloxy-4-biphenylcarbonitryle) 5OCB and its nanocolloids with ${\mathrm{BaTiO}}_{3}$ nanoparticles (NPs) under varying pressure and temperature are presented. The notable impact of NPs on phase transitions an...

[Phys. Rev. E 96, 022705] Published Wed Aug 09, 2017

Electric-field-induced shape transition of nematic tactoids

2017-08-09T10:00:00+00:00

Author(s): Luuk Metselaar, Ivan Dozov, Krassimira Antonova, Emmanuel Belamie, Patrick Davidson, Julia M. Yeomans, and Amin Doostmohammadi

This paper studies the change in shape of nematic droplets under the influence of an electric field, using experiments and numerical simulations. A reversible elongation is possible due to the low elasticity of the liquid crystal and its strong anchoring. The authors are able to observe changes in the aspect ratio up to ten, which may influence the optical properties of the material.

(image)
[Phys. Rev. E 96, 022706] Published Wed Aug 09, 2017

Density functional theory for dense nematic liquid crystals with steric interactions

2017-08-07T10:00:00+00:00

Author(s): Eduardo S. Nascimento, Peter Palffy-Muhoray, Jamie M. Taylor, Epifanio G. Virga, and Xiaoyu Zheng

The celebrated work of Onsager on hard particle systems, based on the truncated second order virial expansion, is valid at relatively low volume fractions for large aspect ratio particles. While it predicts the isotropic-nematic phase transition, it does not provide a realistic equation of state in ...

[Phys. Rev. E 96, 022704] Published Mon Aug 07, 2017

Electrical and thermal tuning of quality factor and free spectral range of optical resonance of nematic liquid crystal microdroplets

2017-08-04T10:00:00+00:00

Author(s): Junaid Ahmad Sofi, M. A. Mohiddon, N. Dutta, and Surajit Dhara

We experimentally study the effect of temperature and electric field on the quality $(Q)$ factor and free spectral range (FSR) of whispering-gallery-mode optical resonance of dye-doped nematic liquid crystal microdroplets. Both the $Q$ factor and the FSR are highly sensitive to the temperature and e...

[Phys. Rev. E 96, 022702] Published Fri Aug 04, 2017

Liquid crystal control of the plasmon resonances at terahertz frequencies in graphene microribbon gratings

2017-08-04T10:00:00+00:00

Author(s): V. Yu. Reshetnyak, V. I. Zadorozhnii, I. P. Pinkevych, and D. R. Evans

We theoretically study the influence of the liquid crystal (LC) orientational state on the absorption, reflection, and transmission spectra of a graphene microribbon grating placed between a nematic LC and an isotropic dielectric substrate. We calculate the absorption, reflection, and transmission c...

[Phys. Rev. E 96, 022703] Published Fri Aug 04, 2017

Optical manipulation and defect creation in a liquid crystal on a photoresponsive surface

2017-08-02T10:00:00+00:00

Author(s): Atefeh Habibpourmoghadam, Lin Jiao, Victor Reshetnyak, Dean R. Evans, and Alexander Lorenz

Light-induced modulations of the refractive index and pattern formation are desirable to generate complex photonic structures via exposure to light. Here we show that local modulations of the effective refractive index and reconfigurable defects can be locally induced in a hybridized thin birefringe...

[Phys. Rev. E 96, 022701] Published Wed Aug 02, 2017

Phase separation and folding in swelled nematoelastic films

2017-07-31T10:00:00+00:00

Author(s): A. P. Zakharov and L. M. Pismen

We explore reshaping of nematoelastic films upon imbibing an isotropic solvent under conditions when isotropic and nematic phases coexist. The structure of the interphase boundary is computed taking into account the optimal nematic orientation governed by interaction of gradients of the nematic orde...

[Phys. Rev. E 96, 012709] Published Mon Jul 31, 2017

Theory of helicoids and skyrmions in confined cholesteric liquid crystals

2017-07-28T10:00:00+00:00

Author(s): Sajedeh Afghah and Jonathan V. Selinger

Cholesteric liquid crystals experience geometric frustration when they are confined between surfaces with anchoring conditions that are incompatible with the cholesteric twist. Because of this frustration, they develop complex topological defect structures, which may be helicoids or skyrmions. We de...

[Phys. Rev. E 96, 012708] Published Fri Jul 28, 2017

Enhancement of polar anchoring strength in a graphene-nematic suspension and its effect on nematic electro-optic switching

2017-07-27T10:00:00+00:00

Author(s): Rajratan Basu

A small quantity of monolayer graphene flakes is doped in a nematic liquid crystal (LC), and the effective polar anchoring strength coefficient between the LC and the alignment substrate is found to increase by an order of magnitude. The hexagonal pattern of graphene can interact with the LC's benze...

[Phys. Rev. E 96, 012707] Published Thu Jul 27, 2017

Influence of a dispersion of magnetic and nonmagnetic nanoparticles on the magnetic Fredericksz transition of the liquid crystal 5CB

2017-07-24T10:00:00+00:00

Author(s): Ahmed Mouhli, Habib Ayeb, Tahar Othman, Jérôme Fresnais, Vincent Dupuis, Ian R. Nemitz, Joel S. Pendery, Charles Rosenblatt, Olivier Sandre, and Emmanuelle Lacaze

A long time ago, Brochard and de Gennes predicted the possibility of significantly decreasing the critical magnetic field of the Fredericksz transition (the magnetic Fredericksz threshold) in a mixture of nematic liquid crystals and ferromagnetic particles, the so-called ferronematics. This phenomen...

[Phys. Rev. E 96, 012706] Published Mon Jul 24, 2017

Role of anchoring energy on the texture of cholesteric droplets: Finite-element simulations and experiments

2017-07-19T10:00:00+00:00

Author(s): Guilhem Poy, Felix Bunel, and Patrick Oswald

We present a numerical method to compute defect-free textures inside cholesteric domains of arbitrary shape. This method has two interesting properties, namely a robust and fast quadratic convergence to a local minimum of the Frank free energy, thanks to a trust region strategy. We apply this algori...

[Phys. Rev. E 96, 012705] Published Wed Jul 19, 2017

Theory of microphase separation in bidisperse chiral membranes

2017-07-13T10:00:00+00:00

Author(s): Raunak Sakhardande, Stefan Stanojeviea, Arvind Baskaran, Aparna Baskaran, Michael F. Hagan, and Bulbul Chakraborty

We present a Ginzburg-Landau theory of microphase separation in a bidisperse chiral membrane consisting of rods of opposite handedness. This model system undergoes a phase transition from an equilibrium state where the two components are completely phase separated to a state composed of microdomains...

[Phys. Rev. E 96, 012704] Published Thu Jul 13, 2017

Nonlinear continuous-wave optical propagation in nematic liquid crystals: Interplay between reorientational and thermal effects

2017-07-11T10:00:00+00:00

Author(s): Alessandro Alberucci, Urszula A. Laudyn, Armando Piccardi, Michał Kwasny, Bartlomiej Klus, Mirosław A. Karpierz, and Gaetano Assanto

We investigate nonlinear optical propagation of continuous-wave (CW) beams in bulk nematic liquid crystals. We thoroughly analyze the competing roles of reorientational and thermal nonlinearity with reference to self-focusing/defocusing and, eventually, the formation of nonlinear diffraction-free wa...

[Phys. Rev. E 96, 012703] Published Tue Jul 11, 2017

Graphene as transmissive electrodes and aligning layers for liquid-crystal-based electro-optic devices

2017-07-10T10:00:00+00:00

Author(s): Rajratan Basu and Samuel A. Shalov

In a conventional liquid crystal (LC) cell, polyimide layers are used to align the LC homogeneously in the cell, and transmissive indium tin oxide (ITO) electrodes are used to apply the electric field to reorient the LC along the field. It is experimentally presented here that monolayer graphene fil...

[Phys. Rev. E 96, 012702] Published Mon Jul 10, 2017

Definite existence of subphases with eight- and ten-layer unit cells as studied by complementary methods, electric-field-induced birefringence and microbeam resonant x-ray scattering

2017-07-07T10:00:00+00:00

Author(s): Zhengyu Feng, A. D. L. Chandani Perera, Atsuo Fukuda, Jagdish K. Vij, Ken Ishikawa, Atsuo Iida, and Yoichi Takanishi

A mixture of two selenium-containing compounds, 80 wt. % AS657 and 20 wt. % AS620, are studied with two complementary methods, electric-field-induced birefringence (EFIB) and microbeam resonant x-ray scattering ($μ\mathrm{RXS}$). The mixture shows the typical phase sequence of Sm-${C}_{A}^{*}$–\fra... [Phys. Rev. E 96, 012701] Published Fri Jul 07, 2017 Chiral edge fluctuations of colloidal membranes 2017-06-30T10:00:00+00:00 Author(s): Leroy L. Jia, Mark J. Zakhary, Zvonimir Dogic, Robert A. Pelcovits, and Thomas R. Powers We study edge fluctuations of a flat colloidal membrane comprised of a monolayer of aligned filamentous viruses. Experiments reveal that a peak in the spectrum of the in-plane edge fluctuations arises for sufficiently strong virus chirality. Accounting for internal liquid crystalline degrees of free... [Phys. Rev. E 95, 060701(R)] Published Fri Jun 30, 2017 Spatially periodic deformations in planar and twisted flexoelectric nematic layers 2017-06-26T10:00:00+00:00 Author(s): M. Buczkowska and G. Derfel Electric field induced deformations in twisted and untwisted planar layers of nematic liquid crystals possessing flexoelectric properties were investigated numerically. The spatially periodic deformations, taking the form of parallel stripes, were found to have smaller free energy than the homogeneo... [Phys. Rev. E 95, 062705] Published Mon Jun 26, 2017 Curvature-driven stability of defects in nematic textures over spherical disks 2017-06-26T10:00:00+00:00 Author(s): Xiuqing Duan and Zhenwei Yao Stabilizing defects in liquid-crystal systems is crucial for many physical processes and applications ranging from functionalizing liquid-crystal textures to recently reported command of chaotic behaviors of active matters. In this work, we perform analytical calculations to study the curvature-driv... [Phys. Rev. E 95, 062706] Published Mon Jun 26, 2017 Chiral smectic-A$and smectic-$C$phases with de Vries characteristics 2017-06-21T10:00:00+00:00 Author(s): Neelam Yadav, V. P. Panov, V. Swaminathan, S. P. Sreenilayam, J. K. Vij, T. S. Perova, R. Dhar, A. Panov, D. Rodriguez-Lojo, and P. J. Stevenson Infrared and dielectric spectroscopic techniques are used to investigate the characteristics of two chiral smectics, namely, 1,1,3,3,5,5,5-heptamethyltrisiloxane 1-[${4}^{′}$-(undecyl-1-oxy)-4-biphenyl(S,S)-2-chloro-3-methylpentanoate] ($\mathrm{MS}{\mathrm{i}}_{3}\mathrm{M}{\mathrm{R}}_{11}$) and t... [Phys. Rev. E 95, 062704] Published Wed Jun 21, 2017 Effect of head group orientation on phospholipid assembly 2017-06-19T10:00:00+00:00 Author(s): Tanay Paul and Jayashree Saha The relationship between bilayer stability and lipid head group orientation is reported. In this work, molecular-dynamics simulations are performed to analyze the structure-property relationship of lipid biomembranes, taking into account coarse-grained model lipid interactions. The work explains the... [Phys. Rev. E 95, 062703] Published Mon Jun 19, 2017 Dielectric relaxation process of a partially unwound helical structure in ferroelectric liquid crystals 2017-06-08T10:00:00+00:00 Author(s): Amit Choudhary, Ambika Bawa, Rajesh, Surinder P. Singh, and Ashok M. Biradar The fluctuations of unwound helical structure have been observed in deformed helix ferroelectric liquid crystal (DHFLC) and conventional FLC sample cells. The helix is partially unwound by strong anchoring on the substrates. In such sample cells, the helical decarlization lines are not observed in t... [Phys. Rev. E 95, 062702] Published Thu Jun 08, 2017 Anisotropy of electrostatic interaction in free-standing smectic-${C}^{*}films 2017-06-07T10:00:00+00:00 Author(s): S. V. Ulyanov The correlation function of the director fluctuations in a free-standing smectic ferroelectric film is calculated theoretically. In the functional of free energy, the anisotropy of the Coulomb interaction of polarization charges is taken into account. The results of calculations were used to obtain ... [Phys. Rev. E 95, 062701] Published Wed Jun 07, 2017 Highly efficient optical director reorientation of liquid-crystalline polymer induced by dye additives 2017-05-31T10:00:00+00:00 Author(s): I. A. Budagovsky, V. N. Ochkin, S. A. Shvetsov, A. S. Zolot'ko, A. Yu. Bobrovsky, N. I. Boiko, and V. P. Shibaev Light-induced director orientation of polymeric liquid-crystalline systems was investigated. The materials under study were composed of a nematic liquid-crystalline polymer (NLCP) and a small amount (0.05–0.5 wt.%) of conformationally active (azobenzene) or stable (anthraquinone) dye impurity. Light... [Phys. Rev. E 95, 052705] Published Wed May 31, 2017 Comparative study of the anchoring strength of reactive mesogens and industrial polyimides used for the alignment of liquid crystals 2017-05-31T10:00:00+00:00 Author(s): T. Sergan, I. Dozov, V. Sergan, and R. Voss We measured the Rapini-Papoular polar anchoring strength coefficientW$for${4}^{′}-pentyl-4-cyanobiphenyl (5CB) on alignment layers formed by the reactive mesogen photopolymers RM 257, RM 82, and RM 84 [4,{4}^{′}$-bis(acryloyl)biphenyl] (by Merck). These materials are commonly used for the phot... [Phys. Rev. E 95, 052706] Published Wed May 31, 2017 Heterogeneous colloidal particles immersed in a liquid crystal 2017-05-30T10:00:00+00:00 Author(s): Setarehalsadat Changizrezaei and Colin Denniston In this paper, we explore anisotropic interactions between particles with heterogeneous boundary conditions inside both nematic and cholesteric liquid crystals. The results show that when particles are put at different distances and angles with respect to each other, new types of defect structures a... [Phys. Rev. E 95, 052703] Published Tue May 30, 2017 Influence of liquid crystalline phases on the tunability of a random laser 2017-05-30T10:00:00+00:00 Author(s): José Trull, Josep Salud, Sergio Diez-Berart, and David O. López In this paper, we report the temperature behavior of an optimized disordered photonic system-based liquid crystal by means of heat capacity and refractive index measurements. The scattering system is formed by a porous borosilicate glass random matrix (about 60%) infiltrated with a smectogenic liqui... [Phys. Rev. E 95, 052704] Published Tue May 30, 2017 Role of length polydispersity in the phase behavior of freely rotating hard-rectangle fluids 2017-05-22T10:00:00+00:00 Author(s): Ariel Díaz-De Armas and Yuri Martínez-Ratón We use the density-functional formalism, in particular the scaled-particle theory, applied to a length-polydisperse hard-rectangle fluid to study its phase behavior as a function of the mean particle aspect ratio${κ}_{0}$and polydispersity${\mathrm{Δ}}_{0}. The numerical solutions of the coexist... [Phys. Rev. E 95, 052702] Published Mon May 22, 2017 Diffusion of chiral molecules and propagation of structural chirality in anisotropic liquids 2017-05-10T10:00:00+00:00 Author(s): Mireille Quémener, Tigran Galstian, Thomas Marmin, Victoria Laroche, and Yves L. Dory Diffusion in nature is usually considered as a smooth redistribution process. However, it appears that the diffusion of chiral molecules and the propagation of chirality may proceed in quite different ways. Indeed, in the present work, unexpected quantization of the spatial concentration of chiral m... [Phys. Rev. E 95, 052701] Published Wed May 10, 2017 Traveling waves and worms in ac-driven electroconvection under external multiplicative noise 2017-04-21T10:00:00+00:00 Author(s): Jong-Hoon Huh In the presence of external multiplicative noise, ac-driven electroconvection (EC) in a nematic liquid crystal is investigated. Noise-induced traveling waves (TWs) including localized ones (worms) are found with a typical, stationary wave. Three kinds of TWs are classified by their dynamic features ... [Phys. Rev. E 95, 042704] Published Fri Apr 21, 2017 Direct observation of coupling between orientation and flow fluctuations in a nematic liquid crystal at equilibrium 2017-04-21T10:00:00+00:00 Author(s): Hiroshi Orihara, Nobutaka Sakurai, Yuji Sasaki, and Tomoyuki Nagaya To demonstrate coupling between orientation and flow fluctuations in a nematic liquid crystal at equilibrium, we simultaneously observe the intensity change due to director fluctuations under a polarizing microscope and the Brownian motion of a fluorescent particle trapped weakly by optical tweezers... [Phys. Rev. E 95, 042705] Published Fri Apr 21, 2017 Fast-switching chiral nematic liquid-crystal mode with polymer-sustained twisted vertical alignment 2017-04-18T10:00:00+00:00 Author(s): Kai-Han Chang, Vinay Joshi, and Liang-Chy Chien We demonstrate a fast-switching liquid-crystal mode with polymer-sustained twisted vertical alignment. By optimizing the polymerization condition, a polymer microstructure with controlled orientation is produced. The polymer microstructure not only synergistically suppresses the optical bounce durin... [Phys. Rev. E 95, 042701] Published Tue Apr 18, 2017 Decomposition of strongly charged topological defects 2017-04-18T10:00:00+00:00 Author(s): Samo Kralj, Bryce S. Murray, and Charles Rosenblatt This paper studies the tendency of two dimensional topological defects of large defect strength to break up into elementary units. The authors study the process and the resulting structures theoretically for different ways of enforcing the defects, and test some of their predictions experimentally in nematic liquid crystals. (image) [Phys. Rev. E 95, 042702] Published Tue Apr 18, 2017 Phase behavior of the thermotropic melt of asymmetric V-shaped molecules 2017-04-18T10:00:00+00:00 Author(s): M. A. Aliev, N. Yu. Kuzminyh, and E. A. Ugolkova The phase behavior of the monodisperse melt of V-shaped molecules composed of two rigid segments of different lengths joined at their ends at an external angleαhas been examined within the Landau–de Gennes approach. Each rigid segment consists of a sequence of monomer units; the anisotropic inte... [Phys. Rev. E 95, 042703] Published Tue Apr 18, 2017 Modulation of unpolarized light in planar-aligned subwavelength-pitch deformed-helix ferroelectric liquid crystals 2017-03-27T10:00:00+00:00 Author(s): Vladimir V. Kesaev, Alexei D. Kiselev, and Evgeny P. Pozhidaev We study the electro-optic properties of subwavelength-pitch deformed-helix ferroelectric liquid crystals (DHFLC) illuminated with unpolarized light. In the experimental setup based on the Mach-Zehnder interferometer, it was observed that the reference and the sample beams being both unpolarized pro... [Phys. Rev. E 95, 032705] Published Mon Mar 27, 2017 Dispersion relation for electromagnetic propagation in stochastic dielectric and magnetic helical photonic crystals 2017-03-21T10:00:00+00:00 Author(s): Carlos G. Avendaño and Arturo Reyes We theoretically study the dispersion relation for axially propagating electromagnetic waves throughout a one-dimensional helical structure whose pitch and dielectric and magnetic properties are spatial random functions with specific statistical characteristics. In the system of coordinates rotating... [Phys. Rev. E 95, 032703] Published Tue Mar 21, 2017 Elastic anisotropy effects on the electrical responses of a thin sample of nematic liquid crystal 2017-03-21T10:00:00+00:00 Author(s): O. A. Gomes, C. A. R. Yednak, R. R. Ribeiro de Almeida, R. T. Teixeira-Souza, and L. R. Evangelista The electrical responses of a nematic liquid crystal cell are investigated by means of the elastic continuum theory. The nematic medium is considered as a parallel circuit of a resistance and a capacitance and the electric current profile across the sample is determined as a function of the elastic ... [Phys. Rev. E 95, 032704] Published Tue Mar 21, 2017 Understanding the origin of liquid crystal ordering of ultrashort double-stranded DNA 2017-03-16T10:00:00+00:00 Author(s): Suman Saurabh, Yves Lansac, Yun Hee Jang, Matthew A. Glaser, Noel A. Clark, and Prabal K. Maiti Recent experiments have shown that short double-stranded DNA (dsDNA) fragments having six- to 20-base pairs exhibit various liquid crystalline phases. This violates the condition of minimum molecular shape anisotropy that analytical theories demand for liquid crystalline ordering. It has been hypoth... [Phys. Rev. E 95, 032702] Published Thu Mar 16, 2017 Phase behavior and characterization of heptamethyltrisiloxane-based de Vries smectic liquid crystal by electro-optics, x rays, and dielectric spectroscopy 2017-03-10T10:00:00+00:00 Author(s): S. P. Sreenilayam, D. M. Agra-Kooijman, V. P. Panov, V. Swaminathan, J. K. Vij, Yu. P. Panarin, A. Kocot, A. Panov, D. Rodriguez-Lojo, P. J. Stevenson, Michael R. Fisch, and Satyendra Kumar A heptamethyltrisiloxane liquid crystal (LC) exhibitingI–\mathrm{Sm}{A}^{*}–\mathrm{Sm}{C}^{*}$phases has been characterized by calorimetry, polarizing microscopy, x-ray diffraction, electro-optics, and dielectric spectroscopy. Observations of a large electroclinic effect, a large increase in the... [Phys. Rev. E 95, 032701] Published Fri Mar 10, 2017 Hierarchy of orientational phases and axial anisotropies in the gauge theoretical description of generalized nematic liquid crystals 2017-02-28T10:00:00+00:00 Author(s): Ke Liu (刘科 子竞), Jaakko Nissinen, Josko de Boer, Robert-Jan Slager, and Jan Zaanen The paradigm of spontaneous symmetry breaking encompasses the breaking of the rotational symmetries$\text{O}(3)$of isotropic space to a discrete subgroup, i.e., a three-dimensional point group. The subgroups form a rich hierarchy and allow for many different phases of matter with orientational ord... [Phys. Rev. E 95, 022704] Published Tue Feb 28, 2017 Electric-field-induced transport of microspheres in the isotropic and chiral nematic phase of liquid crystals 2017-02-23T10:00:00+00:00 Author(s): Jiyoung Oh, Helen F. Gleeson, and Ingo Dierking The application of an electric field to microspheres suspended in a liquid crystal causes particle translation in a plane perpendicular to the applied field direction. Depending on applied electric field amplitude and frequency, a wealth of different motion modes may be observed above a threshold, w... [Phys. Rev. E 95, 022703] Published Thu Feb 23, 2017 Active microrheology of smectic membranes 2017-02-22T10:00:00+00:00 Author(s): Zhiyuan Qi, Kyle Ferguson, Yancey Sechrest, Tobin Munsat, Cheol Soo Park, Matthew A. Glaser, Joseph E. Maclennan, Noel A. Clark, Tatiana Kuriabova, and Thomas R. Powers Thin fluid membranes embedded in a bulk fluid of different viscosity are of fundamental interest as experimental realizations of quasi-two-dimensional fluids and as models of biological membranes. We have probed the hydrodynamics of thin fluid membranes by active microrheology using small tracer par... [Phys. Rev. E 95, 022702] Published Wed Feb 22, 2017 Elasticity of smectic liquid crystals with in-plane orientational order and dispiration asymmetry 2017-02-07T10:00:00+00:00 Author(s): Jaya Kumar Alageshan, Buddhapriya Chakrabarti, and Yashodhan Hatwalne The Nelson-Peliti formulation of the elasticity theory of isolated fluid membranes with orientational order emphasizes the interplay between geometry, topology, and thermal fluctuations. Fluid layers of lamellar liquid crystals such as smectic-$C$, hexatic smectics, and smectic-${C}^{*}$are endowed... [Phys. Rev. E 95, 022701] Published Tue Feb 07, 2017 Orientational action of edge dislocations on the director field in antiferroelectric smectic-${C}_{A}^{*}$films 2017-01-31T10:00:00+00:00 Author(s): P. V. Dolganov, N. S. Shuravin, V. K. Dolganov, and Atsuo Fukuda We report imaging of the director field near edge dislocations in thermotropic antiferroelecric smectic-${C}_{A}^{*}(\mathrm{Sm}{C}_{A}^{*})liquid crystal. Measurements were made in freestanding films with thickness from two to ten smectic layers. We find two different orientations of the molec... [Phys. Rev. E 95, 012711] Published Tue Jan 31, 2017 Propelling and spinning of microsheets in nematic liquid crystals driven by ac electric field 2017-01-30T10:00:00+00:00 Author(s): M. V. Rasna, U. V. Ramudu, R. Chandrasekar, and Surajit Dhara Dynamics of microparticles in isotropic liquids by transducing the energy of an applied electric field have been studied for decades. Recently, such studies in anisotropic media like liquid crystals have opened up new perspectives in colloid science. Here, we report studies on ac-electric-field-driv... [Phys. Rev. E 95, 012710] Published Mon Jan 30, 2017 Motion of a colloidal particle in a nonuniform director field of a nematic liquid crystal 2017-01-27T10:00:00+00:00 Author(s): Beom-Kyu Lee, Sung-Jo Kim, Bohdan Lev, and Jong-Hyun Kim We investigate the dynamics of a single spherical particle immersed in a nematic liquid crystal. A nonuniform director field is imposed on the substrate by a stripe alignment pattern with splay deformation. The particle of homeotropic anchoring at the surface is accompanied by hyperbolic hedgehog or... [Phys. Rev. E 95, 012709] Published Fri Jan 27, 2017 Anisotropic charge transport in ion-conductive photoresponsive polyethylene oxide–based mesomorphic materials 2017-01-25T10:00:00+00:00 Author(s): Corinne Binet, Alexandre Allart, Patrick Judeinstein, and Frédérick Roussel The mechanism of charge motion in conductive and photosensitive mesogenic block copolymers containing polyethylene oxide (PEO) segments is investigated over a wide frequency and temperature range with the broadband dielectric spectroscopy technique. It is found that the ultraviolet (UV) irradiation,... [Phys. Rev. E 95, 012708] Published Wed Jan 25, 2017 Bistable director alignments of nematic liquid crystals confined in frustrated substrates 2017-01-24T10:00:00+00:00 Author(s): Takeaki Araki and Jumpei Nagura We studied in-plane bistable alignments of nematic liquid crystals confined by two frustrated surfaces by means of Monte Carlo simulations of the Lebwohl-Lasher spin model. The surfaces are prepared with orientational checkerboard patterns, on which the director field is locally anchored to be plana... [Phys. Rev. E 95, 012706] Published Tue Jan 24, 2017 Acoustic streaming in two-dimensional freely suspended smectic liquid crystal films 2017-01-24T10:00:00+00:00 Author(s): S. V. Yablonskii, N. M. Kurbatov, and V. M. Parfenyev We study horizontal streaming excited by means of a low-frequency and low-intensity acoustic wave in 2D freely suspended films of thermotropic smectic liquid crystals. Acoustic pressure induces fast periodic transverse oscillations of the film, which produce in-plane stationary couples of vortices s... [Phys. Rev. E 95, 012707] Published Tue Jan 24, 2017 Translational diffusion across a free-standing smectic film above the bulk smectic-A$–isotropic transition temperature 2017-01-20T10:00:00+00:00 Author(s): Izabela Śliwa and A. V. Zakharov Calculations of translational self-diffusion coefficient in free-standing smectic films during a series of layer-thinning transitions as the temperature is raised above the bulk smectic-$A$–isotropic transition have been carried out. A molecular model based upon the random walk theory is applied for... [Phys. Rev. E 95, 012704] Published Fri Jan 20, 2017 Birefringence in the vicinity of the smectic-$A$to smectic-$C$phase transition: Crossover from$XY$critical to tricritical behavior 2017-01-19T10:00:00+00:00 Author(s): Malay Kumar Das, Susanta Chakraborty, Roman Dabrowski, and Michał Czerwiński High-resolution birefringence ($\mathrm{Δ}n$) measurements are carried out to probe the critical behavior at the smectic-$A$–smectic-$C$(Sm-$A$–Sm-$C) phase transition in a binary system. The critical behavior of this transition is explored with the aid of a differential quotient extracted from th... [Phys. Rev. E 95, 012705] Published Thu Jan 19, 2017 Transverse vibration of nematic elastomer Timoshenko beams 2017-01-18T10:00:00+00:00 Author(s): Dong Zhao, Ying Liu, and Chuang Liu Being a rubber-like liquid crystalline elastomer, a nematic elastomer (NE) is anisotropic viscoelastic, and displays dynamic soft elasticity. In this paper, the transverse vibration of a NE Timoshenko beam is studied based on the linear viscoelasticity theory of nematic elastomers. The governing equ... [Phys. Rev. E 95, 012703] Published Wed Jan 18, 2017 Effect of curvature on cholesteric liquid crystals in toroidal geometries 2017-01-17T10:00:00+00:00 Author(s): Ana R. Fialho, Nelson R. Bernardino, Nuno M. Silvestre, and Margarida M. Telo da Gama The confinement of liquid crystals inside curved geometries leads to exotic structures, with applications ranging from biosensors to optical switches and privacy windows. Here we study how curvature affects the alignment of a cholesteric liquid crystal. We model the system on the mesoscale using the... [Phys. Rev. E 95, 012702] Published Tue Jan 17, 2017 Effects of flexoelectricity and weak anchoring on a Freedericksz transition cell 2017-01-05T10:00:00+00:00 Author(s): E. Mema, L. Kondic, and L. J. Cummings We consider a mathematical model that consists of a nematic liquid crystal layer sandwiched between two parallel bounding plates, across which an external field is applied. We investigate how the number and type of solutions for the director orientation within the layer change as the field strength,... [Phys. Rev. E 95, 012701] Published Thu Jan 05, 2017 Viscoelastic nematodynamics 2016-12-27T10:00:00+00:00 Author(s): Stefano S. Turzi Nematic liquid crystals exhibit both crystallike and fluidlike features. In particular, the propagation of an acoustic wave shows an interesting occurrence of some of the solidlike features at the hydrodynamic level, namely, the frequency-dependent anisotropy of sound velocity and acoustic attenuati... [Phys. Rev. E 94, 062705] Published Tue Dec 27, 2016 Nonsingular defects and self-assembly of colloidal particles in cholesteric liquid crystals 2016-12-14T10:00:00+00:00 Author(s): Rahul P. Trivedi, Mykola Tasinkevych, and Ivan I. Smalyukh Cholesteric liquid crystals can potentially provide a means for tunable self-organization of colloidal particles. However, the structures of particle-induced defects and the ensuing elasticity-mediated colloidal interactions in these media remain much less explored and understood as compared to thei... [Phys. Rev. E 94, 062703] Published Wed Dec 14, 2016 Empty smectic liquid crystals of hard nanorings: Insights from a second-virial theory 2016-12-14T10:00:00+00:00 Author(s): H. H. Wensink and C. Avendaño Inspired by recent simulations on highly open liquid crystalline structures formed by rigid planar nanorings, we present a simple theoretical framework explaining the prevalence of smectic over nematic ordering in systems of ring-shaped objects. The key part of our study is a calculation of the excl... [Phys. Rev. E 94, 062704] Published Wed Dec 14, 2016 X-ray and Raman scattering study of orientational order in nematic and heliconical nematic liquid crystals 2016-12-13T10:00:00+00:00 Author(s): Gautam Singh, Jinxin Fu, Dena M. Agra-Kooijman, Jang-Kun Song, M. R. Vengatesan, Mohan Srinivasarao, Michael R. Fisch, and Satyendra Kumar The temperature dependence of the orientational order parameters〈{P}_{2}(\mathrm{cos}β)〉$and$〈{P}_{4}(\mathrm{cos}β)〉$in the nematic ($N$) and twist-bend nematic$({N}_{\mathrm{tb}})$phases of the liquid crystal dimer CB7CB have been measured using x-ray and polarized Raman scattering. The$〈{...

[Phys. Rev. E 94, 060701(R)] Published Tue Dec 13, 2016

Rotational diffusion of shape switching particles in nematic liquid crystals

2016-12-09T10:00:00+00:00

Author(s): R. F. de Souza and C. Zannoni

The theory of rotational diffusion of particles of various symmetry embedded in a liquid crystal host, essential to interpret a variety of spectroscopic observables, has been available for some time, but only for the case of rigid molecules. Here we generalize the treatment and present a theory to d...

[Phys. Rev. E 94, 062702] Published Fri Dec 09, 2016

Elastic interactions between topological defects in chiral nematic shells

2016-12-05T10:00:00+00:00

Author(s): Alexandre Darmon, Olivier Dauchot, Teresa Lopez-Leon, and Michael Benzaquen

We present a self-consistent and robust theoretical model to investigate elastic interactions between topological defects in liquid crystal shells. Accounting for the nonconcentric nature of the shell in a simple manner, we are able to successfully and accurately explain and predict the positions of...

[Phys. Rev. E 94, 062701] Published Mon Dec 05, 2016

Dynamics of disk pairs in a nematic liquid crystal

2016-11-29T10:00:00+00:00

Author(s): Alena Antipova and Colin Denniston

We use a hybrid lattice Boltzmann method to study the behavior of sets of ferromagnetic colloidal disks in a nematic liquid crystal. When a weak rotating magnetic field acts on the system, the disks rotate following the magnetic field. This leads to a distortion in the liquid crystal that drives tra...

[Phys. Rev. E 94, 052704] Published Tue Nov 29, 2016

Transitional subphases near the electric-field-induced phase transition to the ferroelectric phase in Se-containing chiral smectic liquid crystals observed by resonant x-ray scattering

2016-11-14T10:00:00+00:00

Author(s): Atsuo Iida, Yoichi Takanishi, Atsuo Fukuda, and Jagdish K. Vij

Resonant x-ray scattering experiments revealed transitional subphases near the electric-field-induced phase transition of a Se-containing chiral liquid crystal in a planar aligned cell geometry. In the lower-temperature range ($\mathrm{Sm}−{C}_{A}^{*}$ and three-layer periodicity $\mathrm{Sm}−{C}_{γ... [Phys. Rev. E 94, 052703] Published Mon Nov 14, 2016 Inverse stochastic resonance in electroconvection by multiplicative colored noise 2016-11-08T10:00:00+00:00 Author(s): Jong-Hoon Huh A kind of inverse stochastic resonance (ISR) observed in ac-driven electroconvection (EC) in a nematic liquid crystal is presented. In successive pattern evolutions by increasing noise intensity${V}_{\mathrm{N}}$, a typical EC (with a normalized amplitude${\mathbit{A}}_{0}=1$at${V}_{\mathrm{N}}=...

[Phys. Rev. E 94, 052702] Published Tue Nov 08, 2016

Hydrodynamic interactions in freely suspended liquid crystal films

2016-11-03T10:00:00+00:00

Author(s): Tatiana Kuriabova, Thomas R. Powers, Zhiyuan Qi, Aaron Goldfain, Cheol Soo Park, Matthew A. Glaser, Joseph E. Maclennan, and Noel A. Clark

Hydrodynamic interactions play an important role in biological processes in cellular membranes, a large separation of length scales often allowing such membranes to be treated as continuous, two-dimensional (2D) fluids. We study experimentally and theoretically the hydrodynamic interaction of pairs ...

[Phys. Rev. E 94, 052701] Published Thu Nov 03, 2016

Magnetic-field-induced stepwise director reorientation and untwisting of a planar cholesteric structure with finite anchoring energy

2016-10-28T10:00:00+00:00

Author(s): A. N. Zakhlevnykh and V. S. Shavkunov

Within the continuum approach we study the equilibrium configurations of a cholesteric liquid crystal confined between two parallel plates, when a magnetic field is applied perpendicularly to the plates. We analyze the role of soft anchoring boundary conditions on magnetic-field-induced cholesteric-...

[Phys. Rev. E 94, 042708] Published Fri Oct 28, 2016

Self-assembly of colloidal particles in deformation landscapes of electrically driven layer undulations in cholesteric liquid crystals

2016-10-28T10:00:00+00:00

Author(s): Michael C. M. Varney, Qiaoxuan Zhang, Bohdan Senyuk, and Ivan I. Smalyukh

This paper studies the behavior of colloidal particles embedded in a cholesteric liquid-crystal matrix with an applied electric field. The authors observe that the presence of the colloidal objects reduces the threshold for deformations in the liquid crystal. Conversely, periodic deformations in the liquid crystal can be used to form patterns of colloidal particles, which also depend on the particles’ shape.

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[Phys. Rev. E 94, 042709] Published Fri Oct 28, 2016

Persistent quasiplanar nematic texture: Its properties and topological defects

2016-10-26T10:00:00+00:00

Author(s): Pawel Pieranski, Maria Helena Godinho, and Simon Čopar

In the so-called quasiplanar texture of a nematic layer confined between parallel plates with homeotropic anchoring conditions, the director field rotates by $π$ between limit surfaces so that field lines have the shape of a dowsing Y-shaped wooden tool. The orientation of the director field at midh...

[Phys. Rev. E 94, 042706] Published Wed Oct 26, 2016

Numerical study of light-induced phase behavior of smectic solids

2016-10-26T10:00:00+00:00

Author(s): Hayoung Chung, Jaesung Park, and Maenghyo Cho

By the chemical cross-linking of rigid molecules, liquid crystal polymer (LCP) has been envisaged as a novel heterogeneous material due to the fact that various optical and geometric states of the liquid crystalline (LC) phases are projected onto the polymeric constituents. The phase behavior, which...

[Phys. Rev. E 94, 042707] Published Wed Oct 26, 2016

Bragg reflection band width and optical rotatory dispersion of cubic blue-phase liquid crystals

2016-10-21T10:00:00+00:00

Author(s): Hiroyuki Yoshida, Konkanok Anucha, Yasuhiro Ogawa, Yuto Kawata, Masanori Ozaki, Jun-ichi Fukuda, and Hirotsugu Kikuchi

The Bragg reflection band width and optical rotatory dispersion of liquid crystalline cholesteric blue phases (BPs) I and II are compared by numerical simulations. Attention is paid to the wavelength regions for which the reflection bands with lowest photon energies appear, i.e., the $[110]$ directi...

[Phys. Rev. E 94, 042703] Published Fri Oct 21, 2016

Magnetically tunable selective reflection of light by heliconical cholesterics

2016-10-21T10:00:00+00:00

Author(s): S. M. Salili, J. Xiang, H. Wang, Q. Li, D. A. Paterson, J. M. D. Storey, C. T. Imrie, O. D. Lavrentovich, S. N. Sprunt, J. T. Gleeson, and A. Jákli

We present studies of chiral nematic liquid crystals composed of flexible dimer molecules subject to large dc magnetic fields between 0 and 31 T. We observe that these fields lead to selective reflection of light depending on temperature and magnetic field. The band of reflected wavelengths can be t...

[Phys. Rev. E 94, 042705] Published Fri Oct 21, 2016

Computer simulation study of a mesogenic lattice model based on long-range dispersion interactions

2016-10-18T10:00:00+00:00

Author(s): Silvano Romano

In contrast to thermotropic biaxial nematic phases, for which some long sought for experimental realizations have been obtained, no experimental realizations are yet known for their tetrahedratic and cubatic counterparts, involving orientational orders of ranks 3 and 4, respectively, also studied th...

[Phys. Rev. E 94, 042702] Published Tue Oct 18, 2016

Relaxation with long-period oscillation in defect turbulence of planar nematic liquid crystals

2016-10-04T10:00:00+00:00

Author(s): Takayuki Narumi, Yosuke Mikami, Tomoyuki Nagaya, Hirotaka Okabe, Kazuhiro Hara, and Yoshiki Hidaka

Through experiments, we studied defect turbulence, a type of spatiotemporal chaos in planar systems of nematic liquid crystals, to clarify the chaotic advection of weak turbulence. In planar systems of large aspect ratio, structural relaxation, which is characterized by the dynamic structure factor,...

[Phys. Rev. E 94, 042701] Published Tue Oct 04, 2016

Liquid crystal alignment at macroscopically isotropic polymer surfaces: Effect of an isotropic-nematic phase transition

2016-09-30T10:00:00+00:00

Author(s): Natalie Aryasova and Yuri Reznikov

We study the effect of an isotropic-nematic $(I−N)$ phase transition on the liquid crystal alignment at untreated polymer surfaces. We demonstrate that the pattern at the untreated substrate in the planar cell where the other substrate is uniformly rubbed strongly depends on the temperature gradient...

[Phys. Rev. E 94, 032702] Published Fri Sep 30, 2016

Dynamics of electro-orientation of birefringent microsheets in isotropic and nematic liquid crystals

2016-09-29T10:00:00+00:00

Author(s): M. V. Rasna, K. P. Zuhail, U. V. Ramudu, R. Chandrasekar, and Surajit Dhara

We study the dynamics of electric field driven multiaxis electro-orientation of birefringent microsheets in both the isotropic and nematic phases of a liquid crystal. For a fixed direction of applied field in the isotropic phase, there are two critical fields above which the microsheets show two ori...

[Phys. Rev. E 94, 032701] Published Thu Sep 29, 2016

Direct reconstruction of the two-dimensional pair distribution function in partially ordered systems with angular correlations

2016-09-14T10:00:00+00:00

Author(s): I. A. Zaluzhnyy, R. P. Kurta, A. P. Menushenkov, B. I. Ostrovskii, and I. A. Vartanyants

An x-ray scattering approach to determine the two-dimensional (2D) pair distribution function (PDF) in partially ordered 2D systems is proposed. We derive relations between the structure factor and PDF that enable quantitative studies of positional and bond-orientational (BO) order in real space. We...

[Phys. Rev. E 94, 030701(R)] Published Wed Sep 14, 2016

Classification of point-group-symmetric orientational ordering tensors

2016-08-15T10:00:00+00:00

Author(s): Jaakko Nissinen, Ke Liu (刘科 子竞), Robert-Jan Slager, Kai Wu, and Jan Zaanen

The concept of symmetry breaking has been a propelling force in understanding phases of matter. While rotational-symmetry breaking is one of the most prevalent examples, the rich landscape of orientational orders breaking the rotational symmetries of isotropic space, i.e., O(3), to a three-dimension...

[Phys. Rev. E 94, 022701] Published Mon Aug 15, 2016

Hydrodynamic theory for nematic shells: The interplay among curvature, flow, and alignment

2016-08-08T10:00:00+00:00

Author(s): Gaetano Napoli and Luigi Vergori

This paper proposes a hydrodynamic theory of nematic liquid crystals confined to a thin curved surface. The authors use a variational approach to tackle the problem and find an underlying coupling between the curvature, the flow, and the nematic ordering of the liquid crystal. The results can be useful to describe more complicated systems such as topological defects interacting with a backflow, as well as active nematics.

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[Phys. Rev. E 94, 020701(R)] Published Mon Aug 08, 2016

Freedericksz instability for the twisted nematic device: A three-dimensional analysis

2016-07-27T10:00:00+00:00

Author(s): G. I. Sfyris, K. Danas, G. Wen, and N. Triantafyllidis

Of interest here is the fully three-dimensional analysis of the Freedericksz transition for the twisted nematic device (TND), which is widely used in liquid-crystal display monitors. Using a coupled electromechanical variational formulation, the problem is treated as a bifurcation instability trigge...

[Phys. Rev. E 94, 012704] Published Wed Jul 27, 2016

Programming complex shapes in thin nematic elastomer and glass sheets

2016-07-20T10:00:00+00:00

Author(s): Paul Plucinsky, Marius Lemm, and Kaushik Bhattacharya

Nematic elastomers and glasses are solids that display spontaneous distortion under external stimuli. Recent advances in the synthesis of sheets with controlled heterogeneities have enabled their actuation into nontrivial shapes with unprecedented energy density. Thus, these have emerged as powerful...

[Phys. Rev. E 94, 010701(R)] Published Wed Jul 20, 2016

Spherical nematic shells with a threefold valence

2016-07-19T10:00:00+00:00

Author(s): Vinzenz Koning, Teresa Lopez-Leon, Alexandre Darmon, Alberto Fernandez-Nieves, and V. Vitelli

We present a theoretical study of the energetics of thin nematic shells with two charge-one-half defects and one charge-one defect. We determine the optimal arrangement: the defects are located on a great circle at the vertices of an isosceles triangle with angles of ${66}^{∘}$ at the charge-one-hal...

[Phys. Rev. E 94, 012703] Published Tue Jul 19, 2016

Electro-osmosis in nematic liquid crystals

2016-07-05T10:00:00+00:00

Author(s): O. M. Tovkach, M. Carme Calderer, Dmitry Golovaty, Oleg Lavrentovich, and Noel J. Walkington

We derive a mathematical model of a nematic electrolyte based on a variational formulation of nematodynamics. We verify the model by comparing its predictions to the results of the experiments on the substrate-controlled liquid-crystal-enabled electrokinetics. In the experiments, a nematic liquid cr...

[Phys. Rev. E 94, 012702] Published Tue Jul 05, 2016

Wrinkling of a thin film on a nematic liquid-crystal elastomer

2016-07-01T10:00:00+00:00

Author(s): Harsh Soni, Robert A. Pelcovits, and Thomas R. Powers

Wrinkles commonly develop in a thin film deposited on a soft elastomer substrate when the film is subject to compression. Motivated by recent experiments [Agrawal et al., Soft Matter 8, 7138 (2012)] that show how wrinkle morphology can be controlled by using a nematic elastomer substrate, we develo...

[Phys. Rev. E 94, 012701] Published Fri Jul 01, 2016

Theory of the anomalous critical behavior for the smectic-$A$–hexatic transition

2016-06-28T10:00:00+00:00

Author(s): E. I. Kats, V. V. Lebedev, and A. R. Muratov

We propose a theoretical explanation for the long-standing problem of the anomalous critical behavior of the heat capacity near the smectic-$A$–hexatic phase transition. Experiments find a large specific heat critical exponent $α=0.5–0.7$, which is inconsistent with a small negative value $α≈−0.01$ ...

[Phys. Rev. E 93, 062707] Published Tue Jun 28, 2016