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We perform in-plane optical spectroscopy measurement on (00l) FeSe thin-filmgrown on SrTiO$_3$ substrate by pulsed laser deposition method. The studyindicates that the low frequency conductivity consists of two Drude components,a broad one which takes up most of the spectral weight and a very narrow oneroughly below 100-150 \cm. The narrow Drude component locates at so lowfrequencies that no such behavior was observed in iron pnictides. The overallplasma frequency is found to be smaller than the FeAs based compounds,suggesting a stronger correlation effect. Similar to iron pnictides, atemperature-induced spectral weight transfer is observed for FeSe. However, therelevant energy scale is lower. Additionally, different from a recent ARPESmeasurement which revealed a spin density wave (SDW) order at low temperaturefor FeSe thin films grown on SrTiO$_3$ substrate, no signature of the bandstructure reconstruction arising from the formation of the SDW order is seen byoptical measurement in the thick FeSe films.

In-plane optical spectroscopy study on FeSe epitaxial thin film grown on SrTiO$_3$ substrate