Novel Universality Classes in Ferroelectric Liquid Crystals

Amit K Chattopadhyay; Prabir K Mukherjee

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arXiv · 1705.08705

Novel Universality Classes in Ferroelectric Liquid Crystals

Amit K Chattopadhyay·Prabir K Mukherjee

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Abstract

Starting from a Langevin formulation of a thermally perturbed nonlinear elastic model of the ferroelectric smectic-C$^*$ (SmC${*}$) liquid crystals in the presence of an electric field, this article characterizes the hitherto unexplored dynamical phase transition from a thermo-electrically forced ferroelectric SmC${}^{*}$ phase to a chiral nematic liquid crystalline phase and vice versa. The theoretical analysis is based on a combination of dynamic renormalization (DRG) and numerical simulation of the emergent model. While the DRG architecture predicts a generic transition to the Kardar-Parisi-Zhang (KPZ) universality class at dynamic equilibrium, in agreement with recent experiments, the numerical simulations of the model show simultaneous existence of two phases, one a "subdiffusive" (SD) phase characterized by a dynamical exponent value of 1, and the other a KPZ phase, characterized by a dynamical exponent value of 1.5. The SD phase flows over to the KPZ phase with increased external forcing, offering a new universality paradigm, hitherto unexplored in the context of ferroelectric liquid crystals.

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Amit K Chattopadhyay, Prabir K Mukherjee. 2017-05-24. Novel Universality Classes in Ferroelectric Liquid Crystals. https://arxiv.org/abs/1705.08705

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