Entropy-Driven DimerizationEntropy-Driven DimerizationM. Sellitto

被引：0

作者：

Mauro Sellitto ^{[1
]}

机构：

[1] Università degli Studi della Campania “Luigi Vanvitelli”,Dipartimento di Ingegneria

来源：

Journal of Statistical Physics | / 192卷 / 3期

关键词：

Entropy-driven phase transitions; Classical lattice-gas models; Finite-size scaling; Classical Monte Carlo simulations.;

D O I：

10.1007/s10955-025-03426-9

中图分类号：

学科分类号：

摘要：

I introduce a lattice gas model with excluded volume interactions and investigate its phase behavior on the square lattice. Monte Carlo simulations and finite-size scaling show a discontinuous sub-lattice ordering transition towards a high-density solidlike phase characterised by an anti-ferromagnetic dimerized ground state with eightfold degeneracy. Since thermodynamics is controlled by entropy alone this provides a simple athermal realization of a dimerization process. Interestingly, the model can be considered as a special case of a family of hard-core lattice gases with local geometric constraints on both particles and vacancies, which generalizes the one proposed by Biroli and Mézard in the context of glassy systems.

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