The influence by substrate morphology on the Rashba band splitting in graphene
| Autor: | Karin Larsson, M. R. Ashwin Kishore, Amir Hossein Bayani |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Morphology (linguistics) Dirac point General Physics and Astronomy 02 engineering and technology Substrate (electronics) 01 natural sciences DFT Rashba effect law.invention Inorganic Chemistry law 0103 physical sciences Hybridization 010302 applied physics Band splitting Oorganisk kemi Condensed matter physics Condensed Matter::Other Graphene Spin–orbit interaction Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics lcsh:QC1-999 Substrate morphology Spin–orbit coupling Graphene Substrate morphology Spin–orbit coupling Rashba effect DFT Hybridization Spin components BSSE 0210 nano-technology Den kondenserade materiens fysik lcsh:Physics |
| Zdroj: | Results in Physics, Vol 17, Iss, Pp 103065-(2020) |
| Popis: | The influence of substrate morphology on the Rashba band splitting at the Dirac point of graphene, has been theoretically investigated. More specifically, the possibility for this splitting to be caused by spin–orbit coupling (with the heavy metal substrate) was of a special interest to study. The model system consisted of a 4H-SiC (0 0 0 1)/graphene interface, with an intercalated metal layer (Ag and Au, respectively). These intercalating metal layers were built with two different types of morphologies; either flat or buckled (with different buckling positions). The results show that depending on the position of the buckled metal atom, the size of the bandgap and band splitting (at the Dirac point of graphene) will either increase (or decrease). Moreover, the enlargement of the buckling size was also shown to affect the electronic properties of graphene (i.e., by increasing the bandgap). The sizes of the bandgaps and band splitting for the different intercalating metals (Ag and Au), were also found to be different. Spin-projected band structures was also implemented in the present study, with the purpose to show the spin-texture of graphene. It was thereby shown that the spins pined to the x and y spin components for most of the cases. |
| Databáze: | OpenAIRE |
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