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Equilibrium and dynamic behaviors of dechiralisation lines occurring belowSmC* cell boundaries in planar geometry consitute a polemic topic for severaldecades. We report new observations in the SmC* phase of the strongly polarizedliquid crystal CFL08. They are compared with vortex motions in superfluids andtype-II superconductors, and we propose a simple heuristic model attempting toexplain the intriguing mismatch between bulk helix pitch and inter-linesdistance. It results from opposite effects of the helix pitch and surface linescharge value on the equilibrium lines distance. The model assumes that thelines electric interactions dominate the cell equilibrium state. In particularthe unwinding transition of the bulk helix is provoked by field-induceddisplacements of the lines lattices. It permits to relate the lines density andcritical fields to intrinsic energy parameters, and to explain thepitch-distance mismatch, together with its almost constant value across thetransition. We foresee the helix pitch and unwinding field variations vs.sample width.

Dechiralisation lines induced unwinding in confined SmC* liquid crystals