Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session L13: Liquid crystals: Mostly Nematics
2:30 PM–5:42 PM,
Tuesday, March 16, 2010
Sponsoring Unit: DFD
Chair: Fangfu Ye, University of Illinois
Abstract ID: BAPS.2010.MAR.L13.12
Abstract: L13.00012 : A Line Defect Structure in Soft-Mode Turbulence*
4:42 PM–4:54 PM
Preview Abstract Abstract
Rinto A Nur Qomaru Zaman
Michael I. Tribelsky
Defects have been much investigated in various physical systems. The property and symmetry in a system can be reflected by the existence of defects. For example in spin models, symmetries in the 2D XY and 2D Ising models generate point and line defects, respectively. In the soft-mode turbulence (SMT) in electroconvection of homeotropic nematic systems which is a kind of spatiotemporal chaos induced by nonlinear interaction between the Nambu-Goldstone modes and the convective modes, a curious line structure called $blackline$ has been discovered. We measured the density of the blackline as a function of control parameters, ac voltage and frequency. By detailed observations and analysis, it is clarified that the blackline is a structure of the nematic director in the x-y plane and includes a sequence of point defects. We discussed similarity with the density of the blackline and that of the point defect in the conventional 2D XY model. The occurrence of this type of defects is only due to the symmetry in the SMT and independent of the properties of fluctuations.
*This research was partially supported by Grant-in-Aid for Scientific Research from the Ministry of Education, Culture, Sport, Science, and Technology of Japan and the Japan Society for the Promotion of Science.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.MAR.L13.12
The American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics.
1 Physics Ellipse, College Park, MD 20740-3844
Editorial Office 1 Research Road, Ridge, NY 11961-2701 (631) 591-4000
Office of Public Affairs 529 14th St NW, Suite 1050, Washington, D.C. 20045-2001 (202) 662-8700