Change search
ReferencesLink to record
Permanent link

Direct link
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.
Show others and affiliations
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
Identifiers
URN: urn:nbn:se:kth:diva-186990DOI: 10.1103/PhysRevE.93.042708ISI: 000374962900005ScopusID: 2-s2.0-84964598898OAI: oai:DiVA.org:kth-186990DiVA: diva2:929397
Funder
Göran Gustafsson Foundation for Research in Natural Sciences and Medicine, 1303A
Note

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

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Bessarab, Pavel F.
By organisation
Material Physics, MF
In the same journal
Physical Review E. Statistical, Nonlinear, and Soft Matter Physics
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 6 hits
ReferencesLink to record
Permanent link

Direct link