Fig. 2: Spin-resolved ARPES data on BiTeCl.
From: Reversal of spin-polarization near the Fermi level of the Rashba semiconductor BiTeCl
a A schematic of the experimental geometry. Momentum-dependence is mapped by rotating the sample angle θ. Data in this figure is obtained with s-polarized light. Images are plotted with a 2D colorscale shown in the upper-right: red-blue (vertical) denotes spin-polarization and white-black (horizontal) denotes photoemission intensity. b An in-plane (Sy) measurement along Γ-K. An unexpected reversal of the spin-polarization is seen in the outermost bands near EF (beige arrows). c The corresponding momentum distribution curves (MDCs) of spin-up I↑ and spin-down I↓ intensities. Each MDC is integrated within an energy window of 34 meV. Altogether, the MDCs span the energy range from −329 to 41 meV as denoted by the double-arrows in (b). Each I↑↓ pair is normalized by the maximum intensity for that pair to facilitate a comparison between MDCs at different energies. The markers are guides to the eye denoting peak positions, with blue-black-red coloring indicating the overall polarization of each peak. d, e An analogous dataset along Γ-M, in which the outermost bands merge into a single unpolarized peak near EF.
