Journal
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
Volume 94, Issue 2, Pages 260-269Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/1.1458475
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Two possible mechanisms of the temperature-induced variation and jump of the helix pitch in a spatially bounded planar layer of a cholesteric liquid crystal (LC) was considered within the framework of the continuum theory of elasticity. These mechanisms are related to the existence of two configuration curves of the system free energy. The states with local free energy minima on each of the configuration curves correspond to topologically equivalent configurations of the LC director distribution and are quasi-equivalent in this sense. The transitions between such quasi-equivalent states are especially important in the first mechanism of the helix pitch jump proceeding without participation of defects. The second mechanism is related to transitions between the ground states of different configuration curves corresponding to topologically nonequivalent configurations. This mechanism requires either participation of disclination lines or the formation of defects. (C) 2002 MAIK Nauka / Interperiodica.
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