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Metallization of 1T-TaS2 is generally initiated at the domain boundary ofcharge density wave (CDW), at the expense of its long-range order. However, wedemonstrate in this study that the metallization of 1T-TaS2 can be alsorealized without breaking the long-range CDW order upon surface alkali doping.By using scanning tunneling microscopy, we find the long-range CDW order isalways persisting, and the metallization is instead associated with additionalin-gap excitations. Interestingly, the in-gap excitation is near the top of thelower Hubbard band, in contrast to a conventional electron-doped Mott insulatorwhere it is beneath the upper Hubbard band. In combination with the numericalcalculations, we suggest that the appearance of the in-gap excitations near thelower Hubbard band is mainly due to the effectively reduced on-site Coulombenergy by the adsorbed alkali ions.

Realization of metallic state in 1T-TaS2 with persisting long-range order of charge density wave