Waterlike density anomaly in fermions

Marco A. Habitzreuter, Eduardo O. Rizzatti and Marcia C. Barbosa

Physica A: Statistical Mechanics and its Applications, 2023, vol. 630, issue C

Abstract: In this work we explore the one-dimensional extended Hubbard model as a fluid system modeling liquid phases of different densities. This model naturally displays two length scales of interaction, which are connected with waterlike anomalies. We analyze the density anomaly as a function of the model parameters, namely the hopping, on-site and first neighbor interactions. We show that this anomaly is present for a wide range of model parameters and is connected to a ground-state liquid–liquid critical point.

Keywords: Density anomaly; Extended Hubbard model; Residual entropy; Phase transition (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:630:y:2023:i:c:s0378437123007975

DOI: 10.1016/j.physa.2023.129242

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