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We analyze the surface electroclinic effect (SECE) in a material thatexhibits a first order bulk smectic-$A^*$ (Sm-$A^*$) -- smectic-$C^*$(Sm-$C^*$) transition. The effect of a continuously varying degree ofenantiomeric excess on the SECE is also investigated. We show that due to thefirst order nature of the bulk Sm-$A^*$ -- Sm-$C^*$ transition, the SECE can beunusually strong and that as enantiomeric excess is varied, a jump in surfaceinduced tilt is expected. A theoretical state map, in enantiomeric excess -temperature space, features a critical point which terminates a line of firstorder discontinuities in the surface induced tilt. This critical point isanalogous to that found for the phase diagram (in electric field - temperaturespace) for the bulk electroclinic effect. Analysis of the decay of the surfaceinduced tilt, as one moves from surface into bulk shows that for sufficientlyhigh surface tilt the decay will exhibit a well defined spatial kink withinwhich it becomes especially rapid. We also propose that the SECE isadditionally enhanced by the de Vries nature (i.e. small layer shrinkage at thebulk Sm-A* -- Sm-C* transition) of the material. As such the SECE provides anew means to characterize the de Vries nature of a material. We discuss theimplications for using these materials in device applications and propose waysto investigate the predicted features experimentally.

The Surface Electroclinic Effect near the First Order Smectic-A*--Smectic-C* transition

The Surface Electroclinic Effect near the First Order Smectic-A--Smectic-C transition