The morphology of an intercalated Au layer with its effect on the Dirac point of graphene
| Autor: | Karin Larsson, Amir Hossein Bayani |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Band gap lcsh:Medicine 02 engineering and technology Electronic structure 01 natural sciences Article Theoretical chemistry law.invention Inorganic Chemistry Condensed Matter::Materials Science Planar law Electronic and spintronic devices 0103 physical sciences lcsh:Science 010306 general physics Electronic band structure Oorganisk kemi Multidisciplinary Condensed matter physics Graphene lcsh:R 021001 nanoscience & nanotechnology Condensed Matter Physics Symmetry (physics) Physical chemistry Atomistic models lcsh:Q Density functional theory 0210 nano-technology Layer (electronics) Den kondenserade materiens fysik |
| Zdroj: | Scientific Reports Scientific Reports, Vol 10, Iss 1, Pp 1-9 (2020) |
| Popis: | This is a theoretical investigation where Density Functional Theory (DFT) has been used in studying the phenomenon of Au intercalation within the 4H-SiC/graphene interface. The electronic structure of some carefully chosen morphologies of the Au layer has then been of special interest to study. One of these specific Au morphologies is of a more hypothetical nature, whilst the others are, from an experimental point of view, realistic ones. The latter ones were also found to be energetically stable. Band structure calculations showed that intercalated Au layers with morphologies different from a planar Au layer will induce a band gap at the Dirac point of graphene (with up to 174 meV for the morphologies studied in the present work). It should here be mentioned that this bandgap size is four times larger than the energy of thermal motion at room temperature (26 meV). These findings reveal that a wide bandgap at the Dirac point of graphene comes from an inhomogeneous staggered potential on the Au layer, which non-uniformly breaks the sublattice symmetry. The presence of spin-orbit (SO) interactions have also been included in the present study, with the purpose to find out if SO will create a bandgap and/or band splitting of graphene. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|