Fig. 2: Extraction of the surface state doping level and gap size.
From: Anti-site defect-induced disorder in compensated topological magnet MnBi2-xSbxTe4
a Large-area STM topography showing long-range fluctuations on the sample surface. b Variation of the surface state spectra along the line indicated in (a) and their average. The band edge positions \({E}_{{{{{{\rm{VB}}}}}}}\) and \({E}_{{{{{{\rm{CB}}}}}}}\) are indicated. c, d Map of the variation of \({E}_{{{{{{\rm{VB}}}}}}}\) and \({E}_{{{{{{\rm{CB}}}}}}}\) in the same area as shown in (a). e Histogram of the data shown in (c, d). Gaussian fits to the peaks result in band edge positions \({\widetilde{E}}_{{{{{{\rm{VB}}}}}}}=(116\pm 24)\,{{{{{\rm{meV}}}}}}\) and \({\widetilde{E}}_{{{{{{\rm{CB}}}}}}}=(172\pm 20)\,{{{{{\rm{meV}}}}}}\). f Map of the extracted surface state gap \(\Delta =({E}_{{{{{{\rm{CB}}}}}}}-{E}_{{{{{{\rm{VB}}}}}}})/2\). g Histogram of (f) with Gaussian fit resulting in \(\widetilde{\Delta }=(28\pm 10)\,{{{{{\rm{meV}}}}}}\). h Fast Fourier transformation of (f) showing a uniform gap in k-space. Color bar units are given in the panel titles.
