Local detection of spin-orbit splitting by scanning tunneling spectroscopy
- 2 May 2007
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 75 (20), 201401
- https://doi.org/10.1103/physrevb.75.201401
Abstract
We demonstrate that the spin-orbit coupling of two-dimensional surface states can be detected locally by scanning-tunneling spectroscopy (STS). The spin splitting of the surface state induces a singularity in the local density of states which can be detected as a distinct peak in the differential conductance spectrum. From the STS spectrum we can determine the Rashba energy as a measure of the strength of the spin splitting. Its detection and imaging are demonstrated for the surface alloys Bi and Pb on Ag(111), which exhibit particularly large spin-split band structures. The influence of the spin splitting on the surface-state STS spectra of close-packed noble metal surfaces is also discussed.Keywords
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