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Energy surface and minimum energy paths for Fréedericksz transitions in bistable cholesteric liquid crystals
KTH, School of Information and Communication Technology (ICT), Materials- and Nano Physics, Material Physics, MF. Saint Petersburg State University, Russian Federation.
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2016 (English)In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 93, no 4, 042708Article in journal (Refereed) PublishedText
Abstract [en]

The multidimensional energy surface of a cholesteric liquid crystal in a planar cell is investigated as a function of spherical coordinates determining the director orientation. Minima on the energy surface correspond to the stable states with particular director distribution. External electric and magnetic fields deform the energy surface and positions of minima. It can lead to the transitions between states, known as the Fréedericksz effect. Transitions can be continuous or discontinuous depending on parameters of the liquid crystal which determine an energy surface. In a case of discontinuous transition when a barrier between stable states is comparable with the thermal energy, the activation transitions may occur, and it leads to the modification of characteristics of the Fréedericksz effect with temperature without explicit temperature dependencies of liquid crystal parameters. A minimum energy path between stable states on the energy surface for the Fréedericksz transition is found using the geodesic nudged elastic band method. Knowledge of this path, which has maximal statistical weight among all other paths, gives the information about a barrier between stable states and configuration of director orientation during the transition. It also allows one to estimate the stability of states with respect to the thermal fluctuations and their lifetime when the system is close to the Fréedericksz transition.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 93, no 4, 042708
Keyword [en]
Electric-Field, Device, Display, Band
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-186990DOI: 10.1103/PhysRevE.93.042708ISI: 000374962900005ScopusID: 2-s2.0-84964598898OAI: diva2:929397
Göran Gustafsson Foundation for Research in Natural Sciences and Medicine, 1303A

Funding Details: 14-02-00102, RFBR, Russian Foundation for Basic Research

QC 20160518

Available from: 2016-05-18 Created: 2016-05-16 Last updated: 2016-05-30Bibliographically approved

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Bessarab, Pavel F.
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Material Physics, MF
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