Figure 3: Evolution of the surface states' spin polarization with binding energy.
From: Unconventional transformation of spin Dirac phase across a topological quantum phase transition

(a) ARPES k||-EB map of the δ=0.40 sample with dotted lines indicating the energy levels of SR measurements. (b) Momentum distribution curves with highlighted curves chosen for SR measurements. (c) SR momentum distribution spectra and (d) the corresponding net spin polarization measurements.