scholarly journals Creation of topological charges by the spontaneous symmetry breaking phase transition in azo dye-doped nematic liquid crystals

2021 ◽  
Author(s):  
Yonggi Sim ◽  
Hyunhee Choi
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Azo Dye ◽  
Nematic Liquid Crystals ◽  
Topological Charges

scholarly journals Emergence and stabilization of transient twisted defect structures in confined achiral liquid crystals at a phase transition.

Soft Matter ◽  
2021 ◽  
Author(s):  
Jose X Velez ◽  
Zhaofei Zheng ◽  
Daniel A. Beller ◽  
Francesca Serra
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Soft Matter ◽  
Capillary Tube ◽  
Nematic Liquid Crystals ◽  
Defect Structures

Spontaneous emergence of chirality is a pervasive theme in soft matter. We report a transient twist forming in achiral nematic liquid crystals confined to a capillary tube with square cross...

Molecular Ordering in Nematic MBCA and EPAPU

1990 ◽  
Vol 45 (1) ◽  
pp. 29-32
Author(s):  
S. Sreehari Sastry ◽  
V. Venkata Rao ◽  
P. Narayana Murty ◽  
G. Satyanandam ◽  
T. F. Sundar Raj
Keyword(s):  
Phase Transition ◽  
Liquid Crystals ◽  
Order Parameter ◽  
Nematic Phase ◽  
Spin Probe ◽  
Nematic Liquid Crystals ◽  
Experimental Techniques ◽  
First Order ◽  
Molecular Ordering

AbstractBy EPR, two nematic liquid crystals (MBCA and EPAPU) were investigated using a steroidal nitroxide spin probe. In both liquid crystals the isotropic-nematic phase transition is of first order. The observed variation of the order parameter with temperature is compared with predictions from the Maier-Saupe and Humphries-James-Luckhurst models and with results obtained by several other experimental techniques.

scholarly journals Spontaneous Symmetry Breaking of Population in a Nonadiabatically Driven Atomic Trap: An Ising-Class Phase Transition

2006 ◽  
Vol 96 (15) ◽  
Author(s):  
Kihwan Kim ◽  
Myoung-Sun Heo ◽  
Ki-Hwan Lee ◽  
Kiyoub Jang ◽  
Heung-Ryoul Noh ◽  
...  
Keyword(s):  
Phase Transition ◽  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking

scholarly journals Electrically Controlled Diffraction Grating in Azo Dye-Doped Liquid Crystals

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1051 ◽  
Author(s):  
Chuen-Lin Tien ◽  
Rong-Ji Lin ◽  
Chi-Chung Kang ◽  
Bing-Yau Huang ◽  
Chie-Tong Kuo ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Electric Fields ◽  
Azo Dye ◽  
Nematic Liquid Crystals ◽  
Polarized Light ◽  
Dielectric Anisotropy ◽  
Linear Effect ◽  
Periodic Distribution ◽  
The Difference

This research applies the non-linear effect of azo dye-doped liquid crystal materials to develop a small, simple, and adjustable beam-splitting component with grating-like electrodes. Due to the dielectric anisotropy and optical birefringence of nematic liquid crystals, the director of the liquid crystal molecules can be reoriented by applying external electric fields, causing a periodic distribution of refractive indices and resulting in a diffraction phenomenon when a linearly polarized light is introduced. The study also discusses the difference in the refractive index (Δn), the concentration of azo dye, and the rising constant depending on the diffraction signals. The experimental results show that first-order diffraction efficiency can reach ~18% with 0.5 wt % azo dye (DR-1) doped in the nematic liquid crystals.

scholarly journals Spontaneous Symmetry Breaking and Dynamic Phase Transition in Monolayer Silicene

2013 ◽  
Vol 110 (8) ◽  
Author(s):  
Lan Chen ◽  
Hui Li ◽  
Baojie Feng ◽  
Zijing Ding ◽  
Jinglan Qiu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Symmetry Breaking ◽  
Spontaneous Symmetry Breaking ◽  
Dynamic Phase ◽  
Dynamic Phase Transition

Photoexcitation and diffusion of azo dye molecules in nematic liquid crystals

1998 ◽  
Author(s):  
Bendaoud Saad ◽  
Marie-Marguerite Denariez-Roberge ◽  
Tigran V. Galstian
Keyword(s):  
Liquid Crystals ◽  
Azo Dye ◽  
Nematic Liquid Crystals ◽  
Dye Molecules ◽  
And Diffusion
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