Stannarius Ralf, Langer Christian, Weissflog Wolfgang
Institute of Experimental Physics I, University of Leipzig, Linnéstrasse 5, D-04103 Leipzig, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Sep;66(3 Pt 1):031709. doi: 10.1103/PhysRevE.66.031709. Epub 2002 Sep 24.
We report the electro-optic investigation of a liquid crystalline free standing film formed by bent-core (banana-shaped) mesogens. The ground state of the B2 phase in the films is chiral and antiferroelectric, although the mesogenic molecules themselves lack chirality. The films can be switched in lateral electric fields. In the antiferroelectric ground state, the external electric field in the film plane couples to a small residual spontaneous polarization which we attribute to the incomplete compensation of polarizations of neighboring smectic layers, due to a nonzero twist normal to the layers. We derive viscoelastic parameters from the uniform switching dynamics and the structure of domain walls. Dynamic patterns in rotating fields are observed and analyzed.
我们报道了对由弯曲核（香蕉形）液晶元形成的液晶自支撑膜的电光研究。尽管液晶分子本身缺乏手性，但膜中B2相的基态是手性反铁电的。这些膜可以在横向电场中切换。在反铁电基态下，膜平面内的外部电场与一个小的残余自发极化耦合，我们将其归因于由于层间非零扭曲导致相邻近晶层极化的不完全补偿。我们从均匀切换动力学和畴壁结构推导出粘弹性参数。观察并分析了旋转场中的动态模式。
