On the orientational ordering of long rods on a latticeA. Ghosh and D. Dhar
Department of Theoretical Physics, Tata Institute of Fundamental Research - Homi Bhabha Road, Mumbai 400 005, India
received 13 November 2006; accepted in final form 27 February 2007; published April 2007
published online 27 March 2007
We argue that a system of straight rigid rods of length k on a square lattice with only hard-core interactions shows two phase transitions as a function of density for . The system undergoes a phase transition from the low-density disordered phase to a nematic phase as is increased from 0 at , and then again undergoes a re-entrant phase transition from the nematic phase to a disordered phase at .
05.50.+q - Lattice theory and statistics (Ising, Potts, etc.).
64.70.Md - Transitions in liquid crystals.
© Europhysics Letters Association 2007