Asymmetry of the time dynamics of breathers in the electroconvection twist structure of a nematic |
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Authors: | O A Skaldin V A Delev E S Shikhovtseva |
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Institution: | 1149. Institute of Physics of Molecules and Crystals, Ufa Scientific Center, Russian Academy of Sciences, Ufa, 450075, Russia
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Abstract: | Dynamics of breather defects in the periodic structures of rolls arising at electroconvection in nematic liquid crystals twisted by π/2 has been studied experimentally and theoretically. The axial components of the velocity of a hydrodynamic flow in the twist structures of nematics are opposite in the neighboring rolls. Dynamics of the breather defect is the periodic creation and annihilation of a pair of classical dislocations with the topological indices “+1” and “-1.” The annihilation occurs faster than the creation. It has been shown that the asymmetric time dynamics of the breather defect is described well by the solution of the perturbed sine-Gordon equation in the form of an interacting soliton and antisoliton. |
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