Details

Autor(en) / Beteiligte

• Götte, Matthias
• Dahm, Thomas

Titel

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

Ist Teil von

• physica status solidi (b), 2021-01, Vol.258 (1), p.n/a

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Wiley Online Library Journals Frontfile Complete

Beschreibungen/Notizen

• 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 Bi2Se3 and Sb2Te3. It is demonstrated that the extracted out‐of‐plane spin polarization is in very good agreement with the actual out‐of‐plane spin polarization. The spin texture of topological surface states is an important quantity for applications in spintronic devices. Spin Hall effect tunneling spectroscopy uses spin polarized tunneling from a ferromagnetic electrode into the surface of a topological insulator. It is shown that this may be used to measure the spin component perpendicular to the surface plane, which is otherwise difficult to access.