Additional interaction terms enhance the Seebeck coefficient and produce multiple doping-dependent sign changes tied to gap opening and Fermi-surface topology changes.
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In the 2D attractive Hubbard model, Tc is enhanced near Van Hove singularities only for weak interactions, while the global maximum Tc occurs at intermediate coupling away from the singularity.
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The thermopower properties of interacting systems
Additional interaction terms enhance the Seebeck coefficient and produce multiple doping-dependent sign changes tied to gap opening and Fermi-surface topology changes.
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Superconductivity near two-dimensional Van Hove singularities: a determinant quantum Monte Carlo study
In the 2D attractive Hubbard model, Tc is enhanced near Van Hove singularities only for weak interactions, while the global maximum Tc occurs at intermediate coupling away from the singularity.