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Second harmonic light scattering induced by defects in the twist-bend nematic phase of liquid crystal dimers
Shokir A. Pardaev, S. M. Shamid, M. G. Tamba +8
The nematic twist-bend () phase, exhibited by certain thermotropic liquid crystalline (LC) dimers, represents a new orientationally ordered mesophase -- the first…
Theory of Polar Blue Phases
Shaikh M. Shamid, David W. Allender, Jonathan V. Selinger
In liquid crystals, if flexoelectric couplings between polar order and director gradients are strong enough, the uniform nematic phase can become unstable to formation of a modulat…
Statistical mechanics of bend flexoelectricity and the twist-bend phase in bent-core liquid crystals
Shaikh M. Shamid, Subas Dhakal, Jonathan V. Selinger
We develop a Landau theory for bend flexoelectricity in liquid crystals of bent-core molecules. In the nematic phase of the model, the bend flexoelectric coefficient increases as w…
Landau theory-based estimates for viscosity coefficients of uniaxial and biaxial nematic liquid crystals
Shaikh M. Shamid, David W. Allender
Using Landau theory, it is shown that eight phenomenological parameters are needed to describe and distinguish the twelve viscosity coefficients of a biaxial nematic phase, or the…