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We propose a simple theoretical model referred to as the {\it two-band model}to realize both a large Seebeck coefficient and high electrical conductivity,resulting in a high thermoelectric (TE) power factor ($PF$). Using theKubo--Luttinger linear response theory, we apply this model to the TE responseof an FeSe thin film reported by Shimizu {\it et al.} to show a high $PF$ withstrong temperature dependence. The effects of superconducting fluctuations andexcitonic correlations are found to not be critical.

Two-band Model with High Thermoelectric Power Factor and Its Application to FeSe Thin Film