Role of coupling between surface orbitals in SOC enhanced spin splitting
| Autor: | Maciej J. Szary |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Coupling
Angular momentum Materials science Analytical chemistry 02 engineering and technology Surfaces and Interfaces Spin–orbit interaction 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Metal Adsorption Atomic orbital visual_art Materials Chemistry visual_art.visual_art_medium Density functional theory 0210 nano-technology Rashba effect |
| Zdroj: | Surface Science. 684:12-17 |
| ISSN: | 0039-6028 |
| DOI: | 10.1016/j.susc.2019.02.004 |
| Popis: | In this study we investigate the role of coupling between surface orbitals in a giant spin splitting (GSS) observed in the Pb/Ge(111)-1 × 1 adsorption system along Γ − M − Γ ′ . We report, based on the density functional theory that, the magnitude of the GSS depends on the bonding structure of the Pb/Ge interface, varying from 242 to 667 meV for the metallic surface bands. The splitting is shown to be SOC enhanced, with ∼ 93% of the effect being of SOC origin. The split-energy difference observed in the system is a result of a different coupling strength between px/py(Pb) and pz(Pb) orbitals, which produces corresponding values of unquenched orbital angular momentum. The described spin-split pattern corresponds to those observed in Tl/Si(111)-1 × 1, Bi/Si(111)-( 3 × 3 ) R 30 ∘ , and 4/3ML Pb/Ge(111)-( 3 × 3 ) R 30 ∘ , which suggests that, their GSS may also be SOC enhanced. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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