Fig. 3

Tunable band gap in 1T’ WSe₂ with Rb doping. a ARPES maps taken at 10 K for 1T’ WSe₂ along the \(\overline {{\mathrm{\Gamma Y}}}\) direction with increasing Rb dosage. b Conduction band minimum (CBM) and valence band maximum (VBM) as a function of surface electron density. c Extracted band gap as a function of surface electron density. d Evolution of the Rb 3d core level line shape taken with 167 eV photons for increasing amounts of Rb dosage