Prewavy instability-originated dielectric chevrons of electroconvection in nematic liquid crystals

Masato Shiomi, E-Joon Choi, and Jong-Hoon Huh
Phys. Rev. E 102, 042704 – Published 26 October 2020

Abstract

This paper reports the pattern formation and evolution in a high-frequency dielectric regime observed in the AC-driven electroconvection of nematic liquid crystals (NLCs). It is determined that prewavy (PW) instability is essential for the formation and evolution. Specifically, in a twisted-aligned NLC cell, we observe a unique pattern that is comparable to the dielectric chevrons (DCVs) typically observed in a conventional planarly aligned pattern. It is determined to be a combined PW pattern with dielectric normal rolls (DNRs). Moreover, the power indices (αPW, αDNR, and αDCV) are determined from the frequency-dependent thresholds (Vthfα) of PW, DNR, and DCV. By taking into account the appearance of PW and the different power indices, the pattern evolution scenarios for DCV are proposed, which can well explain the previous experimental results. Specifically, the PW-originated DCV2 clearly differs from the defect-mediated DCV1, which is known as a typical pattern evolution.

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  • Received 3 August 2020
  • Revised 30 September 2020
  • Accepted 7 October 2020

DOI:https://doi.org/10.1103/PhysRevE.102.042704

©2020 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Polymers & Soft MatterInterdisciplinary Physics

Authors & Affiliations

Masato Shiomi1, E-Joon Choi2, and Jong-Hoon Huh1

  • 1Department of Physics and Information Technology, Faculty of Computer Science and Systems Engineering, Kyushu Institute of Technology, Fukuoka 820-8502, Japan
  • 2Department of Polymer Science and Engineering, Kumoh National Institute of Technology, Gumi, Gyungbuk 730-701, Korea

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Issue

Vol. 102, Iss. 4 — October 2020

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