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In FeSe-derived superconductors, the lack of a systematic and clean controlon the carrier concentration prevents the comprehensive understanding on thephase diagram and the interplay between different phases. Here by K dosing andangle resolved photoemission study on thick FeSe films andFeSe$_{0.93}$S$_{0.07}$ bulk crystals, the phase diagram of FeSe as a functionof electron doping is established, which is extraordinarily different fromother Fe-based superconductors. The correlation strength remarkably increaseswith increasing doping, while an insulting phase emerges in the heavilyoverdoped regime. Between the nematic phase and the insulating phase, a dome ofenhanced superconductivity is observed, with the maximum superconductingtransition temperature of 44$\pm$2~K. The enhanced superconductivity isindependent of the thickness of FeSe, indicating that it is intrinsic to FeSe.Our findings provide an ideal system with variable doping for understanding thedifferent phases and rich physics in the FeSe family.

Anomalous correlation effects and unique phase diagram of electron doped FeSe revealed by angle resolved photoemission spectroscopy