Ferromagnetic Potts models with multisite interaction

Nir Schreiber, Reuven Cohen, Simi Haber

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We study the q-state Potts model with four-site interaction on a square lattice. Based on the asymptotic behavior of lattice animals, it is argued that when q≤4 the system exhibits a second-order phase transition and when q>4 the transition is first order. The q=4 model is borderline. We find 1/lnq to be an upper bound on Tc, the exact critical temperature. Using a low-temperature expansion, we show that 1/(θlnq), where θ>1 is a q-dependent geometrical term, is an improved upper bound on Tc. In fact, our findings support Tc=1/(θlnq). This expression is used to estimate the finite correlation length in first-order transition systems. These results can be extended to other lattices. Our theoretical predictions are confirmed numerically by an extensive study of the four-site interaction model using the Wang-Landau entropic sampling method for q=3,4,5. In particular, the q=4 model shows an ambiguous finite-size pseudocritical behavior.

Original languageEnglish
Article number032106
JournalPhysical Review E
Issue number3
StatePublished - 8 Mar 2018

Bibliographical note

Publisher Copyright:
© 2018 American Physical Society.


Dive into the research topics of 'Ferromagnetic Potts models with multisite interaction'. Together they form a unique fingerprint.

Cite this