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Title: Qualitative chirality effects on the Casimir-Lifshitz torque with liquid crystals
Authors: Broer, Wijnand
Lu, Bing-Sui
Podgornik, Rudolf
Keywords: Science::Physics
Issue Date: 2021
Source: Broer, W., Lu, B. & Podgornik, R. (2021). Qualitative chirality effects on the Casimir-Lifshitz torque with liquid crystals. Physical Review Research, 3(3), 033238-1-033238-13.
Project: RG160/19(S)
Journal: Physical Review Research
Abstract: We model a cholesteric liquid crystal as a planar uniaxial multilayer system, where the orientation of each layer differs slightly from that of the adjacent one. This allows us to analytically simplify the otherwise acutely complicated calculation of the Casimir-Lifshitz torque. Numerical results differ appreciably from the case of nematic liquid crystals, which can be treated like bloc birefringent media. In particular, we find that the torque deviates considerably from its usual sinusoidal behavior as a function of the misalignment angle. In the case of a birefringent crystal faced with a cholesteric liquid one, the Casimir-Lifshitz torque decreases more slowly as a function of distance than in the nematic case. In the case of two cholesteric liquid crystals, either in the homochiral or in the heterochiral configuration, the angular dependence changes qualitatively as a function of distance. In all considered cases, finite pitch length effects are most pronounced at distances of about 10 nm.
ISSN: 2643-1564
DOI: 10.1103/PhysRevResearch.3.033238
Schools: School of Physical and Mathematical Sciences 
Rights: © 2021 The Authors. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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