Modelling quasicrystals at positive temperature

Details Modelling quasicrystals at positive temperature Modelling quasicrystals at positive temperature

2009-10-28

arxiv.org/abs/0910.5379v1

J. Stat. Phys., 138(2010), 465-475

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

We consider a two-dimensional lattice model of equilibrium statistical mechanics, using nearest neighbor interactions based on the matching conditions for an aperiodic set of 16 Wang tiles. This model has uncountably many ground state configurations, all of which are nonperiodic. The question addressed in this paper is whether nonperiodicity persists at low but positive temperature. We present arguments, mostly numerical, that this is indeed the case. In particular, we define an appropriate order parameter, prove that it is identically zero at high temperatures, and show by Monte Carlo simulation that it is nonzero at low temperatures.

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