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New theoretical results for the Lehmann effect in cholesteric liquid crystalsThe Lehmann effect arising in a cholesteric liquid crystal drop when a temperature gradient is applied parallel to its helical axis is investigated theoretically using a local approach. A pseudoscalar quantity is introduced to allow for cross couplings which are absent in nematic liquid crystals, and the statics and dissipative dynamics are analyzed in detail. It is shown that the Lehmann effect is purely dynamic for the case of an external electric field and purely static for an external density gradient, but includes both dynamic and static coupling contributions for the cases of external temperature or concentration gradients.
Document ID
19880043998
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Brand, Helmut R.
(Universitaet Essen-Gesamthochschule Federal Republic of Germany, United States)
Pleiner, Harald
(California, University Santa Barbara, United States)
Date Acquired
August 13, 2013
Publication Date
April 1, 1988
Publication Information
Publication: Physical Review A - General Physics, 3rd Series
Volume: 37
ISSN: 0556-2791
Subject Category
Solid-State Physics
Accession Number
88A31225
Funding Number(s)
CONTRACT_GRANT: NSF PHY-82-17853
Distribution Limits
Public
Copyright
Other

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