Thermal phase diagrams of columnar liquid crystals

Details Thermal phase diagrams of columnar liquid crystals Thermal phase diagrams of columnar liquid crystals

1998-01-07

arxiv.org/abs/cond-mat/9801051v1

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 9 figures, ReVTeX

Scientific paper

10.1103/PhysRevE.58.5898

In order to understand the possible sequence of transitions from the disordered columnar phase to the helical phase in hexa(hexylthio)triphenylene (HHTT), we study a three-dimensional planar model with octupolar interactions inscribed on a triangular lattice of columns. We obtain thermal phase diagrams using a mean-field approximation and Monte Carlo simulations. These two approaches give similar results, namely, in the quasi one-dimensional regime, as the temperature is lowered, the columns order with a linear polarization, whereas helical phases develop at lower temperatures. The helicity patterns of the helical phases are determined by the exact nature of the frustration in the system, itself related to the octupolar nature of the molecules.

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