Fig. 2
Surface and bulk contributions to the photoemission intensity. a Evolution of bulk and surface features as a function of temperature. b Second derivative (d2I/dE2) of the photoemission intensity shown in a. Solid lines indicate maxima of energy distribution curve fits. Dashed lines in b indicate the position of the maxima in the other half of the graph. c Photoemission intensity of the B-terminated surface. Solid lines indicate position of maxima from fits of the Doniach–Sunjic function to energy distribution curves. d Surface features from c are reproduced as solid red lines. Dashed lines are guides to the eye, connecting the energy distribution curve maxima in a way similar to the calculated band structure3. The estimated bulk structure (blue) is obtained by scaling and shifting of the surface components (see text). Filled areas indicate the width and position of the estimated surface and bulk band gaps. f, g Photoemission intensity for B- and Sm-terminated surfaces. Solid lines indicate maxima of energy distribution curve fits. Dashed line in g indicates the position of the bulk component for B termination. e, h Energy distribution curves for B-and Sm termination. Filled curves in e indicate fits of Doniach–Sunjic functions. Blue dashed curve in h indicates position of the bulk component from B termination (intensity arbitrarily scaled), red dashed curve shows the residual (surface) spectral weight when the bulk component is subtracted from the spectrum. All results obtained with p-polarization
