A possible new phase of antagonistic nematogens in a disorienting field

Details A possible new phase of antagonistic nematogens in a disorienting field A possible new phase of antagonistic nematogens in a disorienting field

2003-05-12

arxiv.org/abs/cond-mat/0305264v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 figures. Accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.90.235701

A simple model is proposed for nematogenic molecules that favor perpendicular orientations as well as parallel ones. (Charged rods, for example, show this antagonistic tendency.) When a small disorienting field is applied along $z$, a low density phase $N_-$ of nematic order parameter $S_z<0$ coexists with a dense biaxial nematic $N_b$. (At zero field, $N_-$ becomes isotropic and $N_b$ uniaxial.) But at stronger fields, a new phase $N_{+4}$, invariant under $\pi/2$ rotations around the field axis, appears in between $N_-$ and $N_b$. Prospects for finding the $N_{+4}$ phase experimentally are briefly discussed.

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