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Iron chalcogenide superconductors are multi-band systems with strong electroncorrelations. Here we use angle-resolved photoemission spectroscopy to studyband dependent correlation effects in single-layer FeSe/Nb:BaTiO3/KTaO3, a newiron chalcogenide superconductor with non-degenerate electron pockets andinterface-enhanced superconductivity. The non-degeneracy of the electron bandshelps to resolve the temperature dependent evolution of different bands. Withincreasing temperature, the single layer FeSe undergoes a band-selectivelocalization, in which the coherent spectral weight of one electron band iscompletely depleted while that of the other one remains finite. In addition,the spectral weight of the incoherent background is enhanced with increasingtemperature, indicating a coherent-incoherent crossover. Signatures ofpolaronic behavior are observed, suggesting electron-boson interactions. Thesephenomena help to construct a more complete picture of electron correlations inthe FeSe family.

Temperature-induced band selective localization and coherent-incoherent crossover in single-layer FeSe/Nb:BaTiO3 /KTaO3