Friday, November 30, 2012

1211.6972 (Nikolai Nikola et al.)

Entropic commensurate-incommensurate transition    [PDF]

Nikolai Nikola, Daniel Hexner, Dov Levine
The equilibrium properties of a minimal tiling model are investigated. The model has extensive ground state entropy, with each ground state having a quasiperiodic sequence of rows. It is found that the transition from the quasiperiodic ground state to the high temperature disordered phase proceeds through a sequence of periodic arrangements of rows, in analogy with the Frenkel-Kontorova model, but with temperature playing the role of the strength of the substrate potential.
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