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http://dx.doi.org/10.18419/opus-5205
Autor(en): | Longa, Lech Trebin, Hans-Rainer |
Titel: | Structure of the elastic free energy for chiral nematic liquid crystals |
Erscheinungsdatum: | 1989 |
Dokumentart: | Zeitschriftenartikel |
Erschienen in: | Physical review, A 39 (1989), S. 2160-2168. URL http://dx.doi.org/10.1103/PhysRevA.39.2160 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-104776 http://elib.uni-stuttgart.de/handle/11682/5222 http://dx.doi.org/10.18419/opus-5205 |
Zusammenfassung: | In Landau–de Gennes theory, the free energy f of liquid crystals is expanded into powers of a symmetric, traceless tensor order parameter Q αβ and its derivatives Q αβ,γ. The expansion is subject to the condition that f is a scalar, i.e., invariant under all rotations of the group SO(3). Using the method of integrity basis, we have established the most general SO(3)-invariant free-energy density up to all powers in Q αβ and up to second order in Q αβ,γ. It turns out that this free-energy density is composed of 39 invariants, which are multiplied by arbitrary polynomials in TrQ 2 and TrQ 3. On the other hand, these 39 invariants can be expressed as polynomials of 33 so-called irreducible invariants. Interestingly, among the irreducible invariants there are only three chiral terms (i.e., linear in Q αβ,γ). They locally give rise to three independent helix modes in chiral, biaxial liquid crystals. This conclusion generalizes results of Trebin [J. Phys. (Paris) 42, 1573 (1981)] and Govers and Vertogen [Phys. Rev. A 31, 1957 (1985); 34, 2520 (1986)] and contradicts a statement of Pleiner and Brand [Phys. Rev. A 24, 2777 (1981); 34, 2528 (1986)], according to which only one twist term is supposed to exist. |
Enthalten in den Sammlungen: | 08 Fakultät Mathematik und Physik |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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tre40.pdf | 16,67 MB | Adobe PDF | Öffnen/Anzeigen |
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