A novel modulated phase of liquid crystals: Covariant elasticity in the context of soft, achiral smectic-C materials
P. R. Venkatramanan, Yashodhan Hatwalne, N. V. Madhusudana
TL;DR
This paper introduces a new modulated phase in achiral smectic-C liquid crystals, based on covariant elasticity theory, and links it to experimental stripe patterns observed.
Contribution
It develops a covariant elasticity framework for achiral smectic-C materials and predicts a novel equilibrium modulated structure with an oblique wavevector.
Findings
Prediction of a stable modulated structure in achiral smectic-C
Consistency with observed stripe patterns in experiments
Extension of covariant elasticity theory to achiral liquid crystals
Abstract
Ginzburg-Landau-de Gennes -type covariant theories are extensively used in connection with twist grain boundary (TGB) phases of chiral smectogens. We analyze the stability conditions for the linear, covariant elasticity theory of smectic-C liquid crystals in the context of achiral materials, and predict an equilibrium modulated structure with an oblique wavevector. We suggest that a previous experimental observation of stripes in smectic-C is consistent with the predicted structure.
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