Volume 85, Number 5, March 2009
|Number of page(s)||6|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||19 March 2009|
Restricted orientation “liquid crystal” in two dimensions: Isotropic-nematic transition or liquid-gas one(?)
Institute of Theoretical Physics, Georg-August-Universität Göttingen - Friedrich-Hund-Platz 1, 37077 Göttingen, Germany, EU
Accepted: 16 February 2009
We present Monte Carlo simulation results of the two-dimensional Zwanzig fluid, which consists of hard line segments which may orient either horizontally or vertically. At a certain critical fugacity, we observe a phase transition with a two-dimensional Ising critical point. Above the transition point, the system is in an ordered state, with the majority of particles being either horizontally or vertically aligned. In contrast to previous work, we identify the transition as being of the liquid-gas type, as opposed to isotropic-to-nematic one. This interpretation naturally accounts for the observed Ising critical behavior. Furthermore, when the Zwanzig fluid is extended to more allowed particle orientations, we argue that in some cases the symmetry of a q-state Potts model with arises. This observation is used to interpret a number of previous results.
PACS: 64.70.F- – Liquid-vapor transitions / 47.11.Qr – Lattice gas / 64.70.M- – Transitions in liquid crystals
© EPLA, 2009
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