Thermotropic nematic materials relax strong distortions by lowering the nematic order: theuniaxial symmetry is broken and is locally replaced by biaxial domains. We investigated the dynamicsof the nematic order near a boundary surface of an asymmetric pi-cell submitted to an external electricfield, close to the electric order reconstruction threshold. An unexpected phenomenon is observed close,but below the threshold: the biaxial order spreads on the surface inducing a consequent bulk topologicalbehaviour equivalent to the splay-bend fast transition allowed by order reconstruction at higher voltage.

Biaxial surface order dynamics in calamitic nematics

Amoddeo A;
2012

Abstract

Thermotropic nematic materials relax strong distortions by lowering the nematic order: theuniaxial symmetry is broken and is locally replaced by biaxial domains. We investigated the dynamicsof the nematic order near a boundary surface of an asymmetric pi-cell submitted to an external electricfield, close to the electric order reconstruction threshold. An unexpected phenomenon is observed close,but below the threshold: the biaxial order spreads on the surface inducing a consequent bulk topologicalbehaviour equivalent to the splay-bend fast transition allowed by order reconstruction at higher voltage.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.12318/6520
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