Entropy-driven phase transition in a polydisperse hard-rods lattice system

Details Entropy-driven phase transition in a polydisperse hard-rods lattice system Entropy-driven phase transition in a polydisperse hard-rods lattice system

2005-03-11

arxiv.org/abs/math/0503222v1

J. Stat. Phys., Vol. 122, Nr. 4 (2006) , p. 761--786

Mathematics

Probability

Scientific paper

10.1007/s10955-005-8085-8

We study a system of rods on the 2d square lattice, with hard-core exclusion. Each rod has a length between 2 and N. We show that, when N is sufficiently large, and for suitable fugacity, there are several distinct Gibbs states, with orientational long-range order. This is in sharp contrast with the case N=2 (the monomer-dimer model), for which Heilmann and Lieb proved absence of phase transition at any fugacity. This is the first example of a pure hard-core system with phases displaying orientational order, but not translational order; this is a fundamental characteristic feature of liquid crystals.

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