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We report the superconductivity evolution of one unit cell (1-UC) and 2-UCFeSe films on SrTiO3(001) substrates with potassium (K) adsorption. By in situscanning tunneling spectroscopy measurement, we find that the superconductivityin 1-UC FeSe films is continuously suppressed with increasing K coverage,whereas non-superconducting 2-UC FeSe films become superconducting with a gapof ~17 meV or ~11 meV depending on whether the underlying 1-UC films aresuperconducting or not. This work explicitly reveals that the interfaceelectron-phonon coupling is strongly related to the charge transfer at FeSe/STOinterface and plays vital role in enhancing Cooper pairing in both 1-UC and2-UC FeSe films.

Superconductivity dichotomy in K-coated single and double unit cell FeSe films on SrTiO3