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Patterns of electroconvection in a nematic liquid crystal Michael Dennin,1

Summary: Patterns of electroconvection in a nematic liquid crystal
Michael Dennin,1
David S. Cannell,2
and Guenter Ahlers2
Department of Physics and Astronomy, University of California at Irvine, Irvine, California 92697-4575
Department of Physics and Center for Nonlinear Science, University of California at Santa Barbara,
Santa Barbara, California 93106
Received 31 January 1997; revised manuscript received 31 July 1997
We present a survey of pattern formation in electroconvection of the nematic liquid crystal 4-ethyl-2-
fluoro-4 -[2-(trans-4-pentylcyclohexyl)-ethyl] biphenyl I52 as a function of three control parameters: the
applied voltage, applied frequency, and electrical conductivity of the sample. The patterns are dominated by
oblique-roll states. Over the lower range of conductivity, the initial transition is a supercritical Hopf bifurcation
which leads to four degenerate modes: right- and left-traveling zig and zag rolls. For higher values of the
conductivity, the primary instability is a subcritical bifurcation to a single set of stationary oblique rolls. The
convecting states exhibit a rich variety of patterns as a result of the interactions between the four modes,
including states of spatiotemporal chaos and localized states. S1063-651X 98 08301-9
PACS number s : 61.30.Gd, 47.54. r, 47.52. j, 47.20. k


Source: Ahlers, Guenter - Department of Physics, University of California at Santa Barbara


Collections: Physics