Bulletin of the American Physical Society
APS March Meeting 2010
Volume 55, Number 2
Monday–Friday, March 15–19, 2010; Portland, Oregon
Session K1: Poster Session II (2:00 pm - 5:00 pm)
Tuesday, March 16, 2010
Room: Exhibit CD
Abstract ID: BAPS.2010.MAR.K1.245
Abstract: K1.00245 : Order Parameter and Response to External Fields in a Spatiotemporal Chaotic System*
Preview Abstract Abstract
Rinto A Nur Qomaru Zaman
For Soft-Mode Turbulence (SMT) which is a new type of spatiotemporal chaos generated by the nonlinear interaction between the Nambu-Goldstone modes and the convective modes in electroconvection of homeotropic nematic systems, a new order parameter called $pattern ordering$ is introduced to measure the degree of order of the convective pattern. It is revealed that two types of SMT pattern called oblique roll and normal roll patterns have zero and finite pattern ordering, so that they can be regarded respectively, as a disordered and an ordered pattern when the so-called Lifshitz frequency is the transition point. Later, by applying an external magnetic field for the oblique roll regime, the Nambu-Goldstone modes is suppressed and therefore leads to a nonzero pattern ordering which behaves as a response. By using an analogy with magnetic susceptibility, we investigate a kind of $pattern susceptibility$ as a degree of order in response of the convective pattern to the applied field. In addition, ac susceptibility due to the modulating field is also discussed.
*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.K1.245
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