2026/04/13 by Joseph Chapman, Justas Gidziunas, Bruno Tomasello +2
Physics and Astronomy · Mathematics · #Theoretical and Computational Physics #Statistical Mechanics and Entropy #Stochastic processes and statistical mechanics
paper · pdf · doi:10.1088/1742-5468/ae8438
Abstract There has been much recent interest devoted to a class of frustrated one-dimensional statistical mechanics lattice models which exhibit sharp thermodynamics. In this work, we study an extension of one of these models to two dimensions, the Ising model on a decorated bilayer lattice. We show that the pseudo-transitions of the one-dimensional models become a real first order phase transition in this two-dimensional analogue. Moreover, the pseudo-transition behaviour is found to still exist above a bi-critical point. This can be characterised as a Widom line, which allows a reinterpretation of the physics in the previously studied one-dimensional models.