New Scenario to Spatio-Temporal Chaos in Normal Rolls Regime with Magnetic Field in Electroconvection of Homeotropic Nematics

Jong Hoon Huh, Yoshiki Hidaka, Shoichi Kai

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We report a new transition scenario from a uniform state to the spatio-temporal chaos (STC) for the electroconvection in the homeotropically aligned nematics, in which a magnetic field is applied perpendicularly to the electric field. Above the Lifshitz frequency fL the amplitude of the electric field increasing, a stationary periodic rolls state becomes unstable, then evolves to STC-I (i.e., the defect chaos) at a certain electric field. At a higher electric field, the second stationary periodic rolls (i.e., abnormal rolls) are also found above a characteristic intensity of the magnetic field H*. At further higher electric field the second stationary periodic rolls state becomes unstable again, then evolves to more complicated STC (STC-II). Above H* the abnormal rolls instability corresponding to an azimuthal rotation of the director plays key roles on the pattern transitions between stationary and non-stationary states as well as between the two stationary ones. Based on the systematic study, a clear phase diagram was determined in the H-ε plane. These results are remarkably different from ones below fL previously reported.

Original languageEnglish
Pages (from-to)497-504
Number of pages8
JournalMolecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume328
DOIs
Publication statusPublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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