Liquid crystals in two dimensions: First-order phase transitions and nonuniversal critical behavior

Details Liquid crystals in two dimensions: First-order phase transitions and nonuniversal critical behavior Liquid crystals in two dimensions: First-order phase transitions and nonuniversal critical behavior

2007-03-29

arxiv.org/abs/cond-mat/0703773v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.98.217801

Liquid crystals in two dimensions undergo a first-order isotropic-to-quasi-nematic transition, provided the particle interactions are sufficiently ``sharp and narrow''. This implies phase coexistence between isotropic and quasi-nematic domains, separated by interfaces. The corresponding line tension is determined, and shown to be very small, giving rise to strong interface fluctuations. When the interactions are no longer ``sharp and narrow'', the transition becomes continuous, with non-universal critical behavior obeying hyperscaling, and approximately resembling the two-dimensional Potts model.

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