Figure 5: Spin-ARPES measurements recorded with hν=22 eV and a four-channel SPLEED polarimeter.

Wide range ARPES spectra of (a) Bi₁Te₁ and (d) Bi₂Te₃ as shown in Fig. 3b,a for the illustration of the k-points k_||,x=±0.19 Å⁻¹ and k_||,x=±0.12 Å⁻¹ (red dashed lines) along which the in-plane spin polarization was measured. Note that the first 800 meV below the Fermi level were boosted in contrast (green dashed area). (b,e) Wide energy spin-polarized EDCs at the indicated two opposing k-points, and effective net spin polarization below. The bar graph in the latter shows the calculated spin polarization. c,f Magnified EDCs and spin polarization close to the Fermi level according to area marked in green in b,e.