Semi-soft Nematic Elastomers and Nematics in Crossed Electric and Magnetic Fields

Details Semi-soft Nematic Elastomers and Nematics in Crossed Electric and Magnetic Fields Semi-soft Nematic Elastomers and Nematics in Crossed Electric and Magnetic Fields

2007-05-11

arxiv.org/abs/0705.1666v1

Phys. Rev. Lett. 98, 147801 (2007)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.98.147801

Nematic elastomers with a locked-in anisotropy direction exhibit semi-soft elastic response characterized by a plateau in the stress-strain curve in which stress does not change with strain. We calculate the global phase diagram for a minimal model, which is equivalent to one describing a nematic in crossed electric and magnetic fields, and show that semi-soft behavior is associated with a broken symmetry biaxial phase and that it persists well into the supercritical regime. We also consider generalizations beyond the minimal model and find similar results.

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