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Grain Boundary Structure: a Signature of Phasons in Incommensurate Smectics

Ramaswamy, Sriram and Toner, John (1991) Grain Boundary Structure: a Signature of Phasons in Incommensurate Smectics. In: Journal of Physics: Condensed Matter, 15 (2). pp. 275-277.

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Official URL: http://iopscience.iop.org/0295-5075/15/2/013


The authors consider a tilt grain-boundary with small angle \theta in an incommensurate smectic $A_{ic}$ liquid crystal with ordering wavenumbers $q_1, q_2$ and sample thickness h in the direction normal to the layers. For $q_1 \theta h \ll 1$, a limit well within the reach of experiment, they find that the dislocation array which forms such a boundary has a spacing $D \sim h^{1/5} \theta^{-4/5}$. This prediction, which is qualitatively different from that obtained for periodic smectics by Nallet and Prost, should serve as a decisive test for the existence of phasons and hence for the truly incommensurate nature of these systems.

Item Type: Journal Article
Publication: Journal of Physics: Condensed Matter
Publisher: Institute of Physics (IOP)
Additional Information: Copyright of this article belongs to Institute of Physics (IOP).
Department/Centre: Division of Physical & Mathematical Sciences > Centre for Theoretical Studies (Ceased to exist at the end of 2003)
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 23 Oct 2007
Last Modified: 16 Nov 2010 10:39
URI: http://eprints.iisc.ac.in/id/eprint/11411

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