Determination of Out-of-plane Spin Polarization of Topological Surface States by Spin Hall Effect Tunneling Spectroscopy
| Autor: | Thomas Dahm, Matthias Götte |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
spectroscopy
FOS: Physical sciences 02 engineering and technology Topology 01 natural sciences tunneling Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences spin texture Quantum tunnelling Surface states Spin-½ 010302 applied physics Physics Spin polarization Spintronics Condensed Matter - Mesoscale and Nanoscale Physics Texture (cosmology) spin Hall effect Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics Electronic Optical and Magnetic Materials topological insulators Topological insulator Spin Hall effect Condensed Matter::Strongly Correlated Electrons 0210 nano-technology |
| Popis: | 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. In the present work we suggest that the out-of-plane spin component can be determined by spin Hall effect tunneling spectroscopy. We derive an analytical formula that allows to extract the out-of-plane spin component from spin Hall effect tunneling spectra. We test our formula using realistic tight-binding models of Bi$_2$Se$_3$ and Sb$_2$Te$_3$. We demonstrate that the extracted out-of-plane spin polarization is in very good agreement with the actual out-of-plane spin polarization. |
| Databáze: | OpenAIRE |
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