Electrically induced structure transition in nematic liquid crystal droplets with conical boundary conditions
URI (for links/citations):https://journals.aps.org/pre/abstract/10.1103/PhysRevE.96.052701
Rudyak, V. Yu.
Krakhalev, M. N.
Sutormin, V. S.
Prishchepa, O. O.
Zyryanov, V. Ya.
Emelyanenko, A. V.
Khokhlov, A. R.
Институт инженерной физики и радиоэлектроники
Кафедра общей физики
Journal Name:Physical review. E
Journal Quartile in Scopus:Q1
Journal Quartile in Web of Science:Q1
Bibliographic Citation:Rudyak, V. Yu. Electrically induced structure transition in nematic liquid crystal droplets with conical boundary conditions [Текст] / V. Yu. Rudyak, M. N. Krakhalev, V. S. Sutormin, O. O. Prishchepa, V. Ya. Zyryanov, J.-H. Liu, A. V. Emelyanenko, A. R. Khokhlov // Physical review. E. — 2017.
Polymer-dispersed liquid crystal composites have been a focus of study for a long time for their unique electro-optical properties and manufacturing by “bottom-up” techniques at large scales. In this paper, nematic liquid crystal oblate droplets with conical boundary conditions (CBCs) under the action of electric ﬁeld were studied by computer simulations and polarized optical microscopy. Droplets with CBCs were shown to prefer an axial-bipolar structure, which combines a pair of boojums and circular disclinations on a surface. In contrast to droplets with degenerate planar boundary conditions (PBCs), hybridization of the two structure types in droplets with CBCs leads to a two-minima energy proﬁle, resulting in an abrupt structure transition and bistable behavior of the system. The nature of the low-energy barrier in droplets with CBCs makes it highly sensitive to external stimuli, such as electric or magnetic ﬁelds, temperature, and light. In particular, the value of the electric ﬁeld of the structure reorientation in droplets with CBCs was found to be a few times smaller than the one for droplets with PBCs, and the droplet state remained stable after switching off the voltage.