Note on « new electromechanical effect in chiral smectic C* liquid crystals »

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Abstract
We show how the recent experimental results concerning an electromechanical coupling in smectic C* can be obtained from the macroscopic dynamic equations derived by the authors. We point out that the coupling observed is a reversible dynamic cross coupling between the change in the polarization inside the layers and velocity gradients. This type of reversible cross coupling is unique to systems which possess a pseudoscalar quantity (e.g. a helix) and does not exist in nonchiral smectic C

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