Honeycomb silicon on alumina: Massless Dirac fermions in silicene on substrate
| Autor: | Friedhelm Bechstedt, Davide Grassano, Paola Gori, Ihor Kupchak, Olivia Pulci |
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| Přispěvatelé: | Gori, Paola, Kupchak, Ihor, Bechstedt, Friedhelm, Grassano, Davide, Pulci, Olivia |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Settore FIS/03 Silicon Condensed matter physics Silicene Honeycomb (geometry) chemistry.chemical_element Heterojunction 02 engineering and technology Substrate (electronics) 021001 nanoscience & nanotechnology 01 natural sciences symbols.namesake Condensed Matter::Materials Science Dirac fermion chemistry 0103 physical sciences Monolayer symbols 010306 general physics 0210 nano-technology Electronic band structure |
| Popis: | We predict the stability of a graphenelike silicene sheet on one monolayer of aluminum oxide. We find that the honeycomb buckled structure of silicene is not broken upon interaction with one monolayer of ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ in the kagome geometry. As a consequence, the electronic band structure shows unperturbed cones with massless Dirac fermions embedded into ${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$-derived bands. The heterostructure conserves the topological character of the freestanding silicene. The optical properties of the silicene/${\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ bilayers clearly maintain the characteristic infrared universal limit of $\ensuremath{\pi}\ensuremath{\alpha}$. A quantized absorbance $N\ifmmode\cdot\else\textperiodcentered\fi{}\ensuremath{\pi}\ensuremath{\alpha}$ (with $N$ silicene layers) also occurs for stacking of multilayers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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