Additional interaction terms enhance the Seebeck coefficient and produce multiple doping-dependent sign changes tied to gap opening and Fermi-surface topology changes.
3 and 4 show an additional sign change of the Seebeck coefficient near quarter-filling, which is robust forT /t≲1
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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.