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Determining the detailed spin texture of topological surface states is important when one wants to apply topological insulators in spintronic devices. In principle, the in‐plane spin component of the surface states can be measured by a method analogous to the so‐called Meservey–Tedrow technique. Herein, it is suggested that the out‐of‐plane spin component can be determined by spin Hall effect tunneling spectroscopy. An analytical formula that allows to extract the out‐of‐plane spin component from spin Hall effect tunneling spectra is derived. The formula is tested using realistic tight‐binding models of Bi 2 Se 3  and Sb 2 Te 3 . It is demonstrated that the extracted out‐of‐plane spin polarization is in very good agreement with the actual out‐of‐plane spin polarization.

Determination of Out‐of‐Plane Spin Polarization of Topological Surface States by Spin Hall Effect Tunneling Spectroscopy