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Athermal tricriticality
Phys. Rev. E 111, L042101 – Published 7 April, 2025
DOI: https://doi.org/10.1103/PhysRevE.111.L042101
Abstract
I construct a two dimensional monodisperse lattice gas model with selective geometric constraints featuring a fluid-solid continuous phase transition on the square lattice and a dimerized ground state with fourfold degeneracy. Finite-size scaling analysis confirms that the lattice gas belongs to the universality class of two-dimensional four-state Potts model, and since its thermodynamics is governed by entropy alone, this provides possibly the simplest statistical mechanical realization of an athermal tricritical point.
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