New classification of chevrons in electroconvection in homeotropically-aligned nematics

Jong Hoon Huh, Yoshiki Hidaka, Shoichi Kai

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Two types of chevrons have been found in the conduction regime, as well as the conventional chevrons in the dielectric regime in homeotropically-aligned nematics. These two are named the defect-mediated chevron (DMC) and the defect-free chevron (DFC) by their structure changes. Two different bifurcation sequences are found with increasing the applied voltage, such as Fréedericksz transition → normal rolls → abnormal rolls → defect chaos →DMC for low frequencies and Fréedericksz transition → prewavy pattern → DFC for high frequencies. Moreover, the double periodicity of the chevrons (i.e., the short wavelength λ1 of the striated rolls and the long wavelength λ2 of the chevron bands) shows quite specific frequency dependence.

Original languageEnglish
Pages (from-to)833-840
Number of pages8
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume366
DOIs
Publication statusPublished - Jan 1 2001

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Defects
defects
Wavelength
wavelengths
Chaos theory
chaos
periodic variations
low frequencies
conduction
Electric potential
electric potential

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

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abstract = "Two types of chevrons have been found in the conduction regime, as well as the conventional chevrons in the dielectric regime in homeotropically-aligned nematics. These two are named the defect-mediated chevron (DMC) and the defect-free chevron (DFC) by their structure changes. Two different bifurcation sequences are found with increasing the applied voltage, such as Fr{\'e}edericksz transition → normal rolls → abnormal rolls → defect chaos →DMC for low frequencies and Fr{\'e}edericksz transition → prewavy pattern → DFC for high frequencies. Moreover, the double periodicity of the chevrons (i.e., the short wavelength λ1 of the striated rolls and the long wavelength λ2 of the chevron bands) shows quite specific frequency dependence.",
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