Geometrically-controlled twist transitions in nematic cells

Details Geometrically-controlled twist transitions in nematic cells Geometrically-controlled twist transitions in nematic cells

2002-02-26

arxiv.org/abs/cond-mat/0202469v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.88.245502

We study geometrically-controlled twist transitions of a nematic confined between a sinusoidal grating and a flat substrate. In these cells the transition to the twisted state is driven by surface effects. We have identified the mechanisms responsible for the transition analytically and used exact numerical calculations to study the range of surface parameters where the twist instability occurs. Close to these values the cell operates under minimal external fields or temperature variations.

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