Sep 18 – 21, 2019
Europe/Warsaw timezone

Twist-bend nematic phase in the presence of molecular chirality

Not scheduled


Poster Session 8


Mr Wojciech Tomczyk (M. Smoluchowski Institute of Physics (Jagiellonian University))


Twist-bend nematic $\left(N_\text{TB}\right)$ [1, 2] is a fifth member of the nematic family, beyond uniaxial $\left(N_\text{U}\right)$ and biaxial $\left(N_\text{B}\right)$ nematics, cholesteric $\left(N^{\ast}\right)$ and blue phases $\left(\text{BP}\right)$. Its uniqueness arises from a double degenerate ground-state (ambidextrous chirality) with a periodically modulated heliconical structure possessing a nanoscale pitch, which is formed from achiral bent-shaped molecules [3]. It is a profound example of so-called spontaneous (chiral) symmetry breaking in achiral materials. Despite the short time since the discovery, $N_\text{TB}$ has already found applications [4].

In this work [5], we present investigations based on Landau-de Gennes theory of chiral nematics, supplemented by terms representing molecular steric polarization [6]. With the helicity mode expansion for the alignment tensor $\mathbf{Q}(\mathbf{r})$ and the polarization $\mathbf{P}(\mathbf{r})$ fields we study relative stability and properties of $\left(N^{\ast}\right)$ and $\left(N_\text{TB}\right)$ for bent-core materials with chiral centers or dopants.

This work was supported by the Grant No. DEC-2013/11/B/ST3/04247 of the National Science Centre in Poland. W.T. acknowledges the financial support by Marian Smoluchowski Scholarship (KNOW/58/SS/WT/2016) from Marian Smoluchowski Cracow Scientific Consortium "Matter-Energy-Future" within the KNOW grant and by Jagiellonian Interdisciplinary PhD Programme co-financed from the European Union funds under the European Social Fund (POWR.03.05.00-00-Z309/17-00).

[1] I. Dozov, Europhys. Lett. 56, 247 (2001).
[2] V. Borshch et al., Nat. Commun. 4, 2635 (2013).
[3] R. Mandle, Soft Matter 12, 7883 (2016).
[4] J. Xiang et al., Adv. Mater. 27, 3014 (2015).
[5] L. Longa and W. Tomczyk, Liq. Cryst. 45, 2074 (2018).
[6] L. Longa and G. Pająk, Phys. Rev. E 93, 040701 (2016).

Primary author

Prof. Lech Longa (M. Smoluchowski Institute of Physics, Department of Statistical Physics, Jagiellonian University)


Mr Wojciech Tomczyk (M. Smoluchowski Institute of Physics (Jagiellonian University))

Presentation materials

There are no materials yet.