Grandjean-Cano pattern

Fig. 4.2.9. Grandjean-Cano pattern of edge dislocations in a cholesteric wedge formed between a cylindrical lens and a flat plate (a) without a magnetic field and (b) with a magnetic field normal to the spiral axis and the dislocation line. The double dislocations - the darker lines-become zig-zag in the presence of the magnetic field while the single dislocations remain stable. (The Orsay Liquid...

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