Observation of an electron band above the Fermi level in FeTe${}_{0.55}$Se${}_{0.45}$ from \emph{in-situ} surface doping

P. Zhang, P. Richard, N. Xu +7

We used \emph{in-situ} potassium (K) evaporation to dope the surface of the iron-based superconductor FeTe${}_{0.55}$Se${}_{0.45}$. The systematic study of the bands near the Fermi lev…