Successive Phase Transitions in Antiferroelectric Liquid Crystal Systems
Masaya Koroishi, Masashi Torikai, Mamoru Yamashita
TL;DR
This paper investigates a theoretical XY model to explain the complex phase transitions observed in chiral liquid crystals, revealing the presence of devil's staircase phenomena in different symmetry phases.
Contribution
It introduces a model capturing both Ising and XY symmetric phases in antiferroelectric liquid crystals, explaining experimental phase behaviors.
Findings
Identification of devil's staircase in phase diagrams
Demonstration of Ising and XY symmetric phases
Correlation with experimental observations
Abstract
An axial next-nearest-neighbor XY model is studied as a model of chiral liquid crystals which exhibit many ferro-, ferri- and antiferroelectric tilted smectic phases. Depending on the values of interaction parameters, this model exhibits Ising symmetric (i.e., the tilt directions of directors are parallel or anti parallel) phases or XY symmetric phases. Phases with each type-of-symmetry show the character of devil's staircase, which has been observed in experiments.
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Taxonomy
TopicsLiquid Crystal Research Advancements · Molecular spectroscopy and chirality · Nonlinear Waves and Solitons