Silicene on Ag(111): an honeycomb lattice without Dirac bands
| Autor: | Mahatha, Sanjoy Kr., Moras, Paolo, Bellini, Valerio, Sheverdyaeva, Polina M., Struzzi, Claudia, Petaccia, Luca, Carbone, Carlo |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 89, 201416 (2014) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.89.201416 |
| Popis: | The discovery of (4x4) silicene formation on Ag(111) raised the question on whether silicene maintains its Dirac fermion character, similar to graphene, on a supporting substrate. Previous photoemission studies indicated that the {\pi}-band forms Dirac cones near the Fermi energy, while theoretical investigations found it shifted at deeper binding energy. By means of angle-resolved photoemission spectroscopy and density functional theory calculations we show instead that the {\pi}-symmetry states lose their local character and the Dirac cone fades out. The formation of an interface state of free-electron-like Ag origin is found to account for spectral features that were theoretically and experimentally attributed to silicene bands of {\pi}-character. Comment: 14 pages, 4 figures |
| Databáze: | arXiv |
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