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Hexagonal FeSe thin films were grown on SrTiO3 substrates and the temperatureand thickness dependence of their electronic structures were studied. Thehexagonal FeSe is found to be metallic and electron doped, whose Fermi surfaceconsists of six elliptical electron pockets. With decreased temperature, partsof the bands shift downward to high binding energy while some bands shiftupwards to EF. The shifts of these bands begin around 300 K and saturate at lowtemperature, indicating a magnetic phase transition temperature of about 300 K.With increased film thickness, the Fermi surface topology and band structureshow no obvious change except some minor quantum size effect. Our paper reportsthe first electronic structure of hexagonal FeSe, and shows that the possiblemagnetic transition is driven by large scale electronic structurereconstruction.

The electronic structure and magnetic phase transition of hexagonal FeSe thin films studied by photoemission spectroscopy