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arXiv · 1306.0245

Interband spin-orbit coupling between anti-parallel spin states in Pb quantum well states

Bartosz Slomski·Gabriel Landolt·Stefan Muff·Fabian Meier·Jürg Osterwalder·J. Hugo Dil
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Abstract

Using spin and angle-resolved photoemission spectroscopy we investigate a momentum region in Pb quantum well states on Si(111) where hybridization between Rashba-split bands alters the band structure significantly. Starting from the Rashba regime where the dispersion of the quasi-free two-dimensional electron gas is well described by two spin-polarized parabolas, we find a breakdown of the Rashba behavior which manifests itself (i) in a spin splitting that is no longer proportional to the in-plane momentum and (ii) in a reversal of the sign of the momentum splitting. Our experimental findings are well explained by including interband spin-orbit coupling that mixes Rashba-split states with anti-parallel rather than parallel spins. Similar results for Pb/Cu(111) reveal that the proposed hybridization scenario is independent on the supporting substrate.

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Bartosz Slomski, Gabriel Landolt, Stefan Muff, Fabian Meier, Jürg Osterwalder, J. Hugo Dil. 2013-06-02. Interband spin-orbit coupling between anti-parallel spin states in Pb quantum well states. https://doi.org/10.1088/1367-2630%2F15%2F12%2F125031

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