Breathers in the one-dimensional roll structure of twisted nematics |
| |
Authors: | O A Skaldin V A Delev E S Shikhovtseva E S Batyrshin Yu A Lebedev |
| |
Institution: | 1.Institute of Physics of Molecules and Crystals, Ufa Scientific Center,Russian Academy of Sciences,Ufa,Russia;2.Ufa State Aviation Technical University,Ufa,Russia |
| |
Abstract: | The dynamics of nonsingular defects has been studied experimentally and theoretically in the periodic roll structures arising
at electroconvection in nematic liquid crystals twisted by π/2. The presence of an axial component of the velocity of the
hydrodynamic flow with the opposite direction in the neighboring rolls is characteristic of roll structures in twisted nematics.
The quantitative estimates of the critical frequency of the oscillations of structural defects have been obtained on the basis
of the nonlinear equation of motion for the roll displacement. It has been found that the periodic creation and annihilation
of a pair of edge dislocations with the topological indices +1 and −1 occur in the process of oscillations of a defect with
a nonsingular nucleus. It has been demonstrated that oscillating defects with zero topological indices correspond to the solution
of the sine-Gordon equation in the form of standing breathers. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |