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Fluctuation-Induced First-Order Phase Transition in an Anisotropic Planar Model of N2 on Graphite

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Monte Carlo simulations are used to show that the orientational ordering transition of planar quadrupoles on a triangular lattice is first order. The orientational ground state is a herringbone structure, and the transition lies in the universality class of a (n=3, d=2) Heisenberg model with face-oriented cubic anisotropy. The Monte Carlo results are related to recent low-energy electron-diffraction studies of N2 on graphite. Domainwall motion and the applicability of this model to herringbone phases of liquid crystals are also discussed.

TidsskriftPhysical Review Letters
Udgave nummer3
Sider (fra-til)181-184
Antal sider4
StatusUdgivet - 1982
Eksternt udgivetJa

ID: 238392909