Chiral Incommensurate Helical Phase in a Smectic of Achiral Bent-Core Mesogens.
Phys Rev Lett
; 122(10): 107801, 2019 Mar 15.
Article
em En
| MEDLINE
| ID: mdl-30932628
ABSTRACT
An achiral, bent-core mesogen forms several tilted smectic liquid crystal phases, including a nonpolar, achiral de Vries smectic A which transitions to a chiral, ferroelectric state in applied electric fields above a threshold. At lower temperature, a chiral, ferrielectric phase with a periodic, supermolecular modulation of the tilt azimuth, indicated by a Bragg peak in carbon-edge resonant soft x-ray scattering, is observed. The absence of a corresponding resonant umklapp peak identifies the superlayer structure as a twist-bend-like helix that is only weakly modulated by the smectic layering.
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MEDLINE
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En
Ano de publicação:
2019
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Article