| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - Dynamics of defects in electroconvection patterns
|
| Date
| |
| has manifestation of work
| |
| related by
| |
| Author
| |
| Abstract
| - In homeotropically aligned nematics with negative dielectric anisotropy the electrohydrodynamic instability occurs above a bend Fréedericksz transition. In the presence of a magnetic field $\vec{H}$ parallel to the liquid crystal slab, ordered roll patterns with a well-defined uniform wave vector $\vec{k}_{id}$ appear above the onset of convection. By rotating the cell around an axis perpendicular to the slab by a small angle α, one can manipulate the system into a state with wave vector $\vec{k}=\vec{k}_{id}+\Delta \vec{k}$, where $\Delta \vec{k}$ is roughly perpendicular to $\vec{k}_{id}$. We have studied experimentally the motion of defects, which then move essentially perpendicular to the rolls. The direction as well as the magnitude of the velocity as a function of $\Delta \vec{k}$ agrees with predictions of the weakly nonlinear theory. In particular, we obtain evidence for the nonanalyticity for $\Delta \vec{k} \to 0$.
|
| article type
| |
| publisher identifier
| |
| Date Copyrighted
| |
| Rights
| |
| Rights Holder
| |
| is part of this journal
| |
| is primary topic
of | |
