Related Experiment Videos
Devil's staircase and harmless staircase in the smectic-C*alpha phase in an electric field
Barbara Rovsek1, Mojca Cepic, Bostjan Zeks
1Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 17, 2004
Summary
The study reveals how the helical smectic-C*alpha structure unwinds in an electric field, showing a devil
Area of Science:
- Liquid crystal physics
- Soft matter science
- Condensed matter theory
Background:
- Smectic-C*alpha phases exhibit complex helical structures.
- External electric fields can influence these helical structures.
- Understanding phase transitions is crucial in liquid crystal research.
Purpose of the Study:
- To investigate the unwinding of the short pitch helical smectic-C*alpha structure.
- To analyze the behavior under an external electric field.
- To model the structural transitions using a discrete phenomenological approach.
Main Methods:
- Development of a discrete phenomenological model.
- Simulation of helical structure unwinding in electric fields.
- Analysis of pitch changes and structural commensurability.
Main Results:
- The pitch increases quasicontinuously at low fields, commensurate with layer thickness.
- Stable structures follow a devil's staircase model.
- At higher fields, pitch grows discontinuously in steps, and the final unwinding is discontinuous.
Conclusions:
- The electric field-induced unwinding of smectic-C*alpha structures exhibits complex, stepwise behavior.
- The devil's staircase model effectively describes the observed structural transitions.
- Achiral next-nearest-layer interactions influence the final unwinding transition.