Thermodynamics of the metal-insulator transition in the extended Hubbard model

Abstract

In contrast to the Hubbard model, the extended Hubbard model, which additionally accounts for non-local interactions, lacks systemic studies of thermodynamic properties especially across the metal-insulator transition. Using a variational principle, we perform such a systematic study and describe how non-local interactions screen local correlations differently in the Fermi-liquid and in the insulator. The thermodynamics reveal that non-local interactions are at least in parts responsible for first-order metal-insulator transitions in real materials.

arXiv comment19 pages, 9 figures. Resubmission to SciPost

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• Thermodynamics of the metal-insulator transition in the extended Hubbard model from determinantal quantum Monte Carlo
• CDMFT+HFD : an extension of dynamical mean field theory for nonlocal interactions applied to the single band extended Hubbard model
• Two-dimensional extended Hubbard model: doping, next-nearest neighbor hopping and phase diagrams
• Short-range charge fluctuations in the two-dimensional Hubbard model
• Terminable Transitions in a Topological Fermionic Ladder
• Relevance of long-range screening in Mott transition examined via a hydrogen lattice
• Nonlocal Exchange Interactions in Strongly Correlated Electron Systems