A discotic disguised as a smectic: A hybrid columnar bragg glass |
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Authors: | Saunders Radzihovsky Toner |
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Institution: | Department of Physics, Materials Science Institute and Institute of Theoretical Science, University of Oregon, Eugene, Oregon 97403, USA. |
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Abstract: | We show that discotics, lying deep in the columnar phase, can exhibit an x-ray scattering pattern which mimics that of a somewhat unusual smectic liquid crystal. This exotic, new glassy phase of columnar liquid crystals, which we call a "hybrid columnar Bragg glass," can be achieved by confining a columnar liquid crystal in an anisotropic random environment of, e.g., strained aerogel. Long-ranged orientational order in this phase makes single-domain x-ray scattering possible, from which a wealth of information could be extracted. We give detailed quantitative predictions for the scattering pattern in addition to exponents characterizing anomalous elasticity of the system. |
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