Data di Pubblicazione:
2017
Citazione:
Electronic States of Silicene Allotropes on Ag(111) / P.M. Sheverdyaeva, S.K. Mahatha, P. Moras, L. Petaccia, G. Fratesi, G. Onida, C. Carbone. - In: ACS NANO. - ISSN 1936-0851. - 11:1(2017 Jan 24), pp. 975-982. [10.1021/acsnano.6b07593]
Abstract:
Silicene, a honeycomb lattice of silicon, presents a particular case of allotropism on Ag(111). Silicene forms multiple structures with alike in-plane geometry but different out-of-plane atomic buckling and registry to the substrate. Angle-resolved photoemission and first-principles calculations show that these silicene structures, with (4×4), (√13×√13)R13.9°, and (2√3×2√3)R30° lattice periodicity, display similar electronic bands despite the structural differences. In all cases the interaction with the substrate modifies the electronic states, which significantly differ from those of free-standing silicene. Complex photoemission patterns arise from surface umklapp processes, varying according to the periodicity of the silicene allotropes.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
angle-resolved photoemission spectroscopy (ARPES); density functional theory (DFT); low-energy electron diffraction (LEED); silicene
Elenco autori:
P.M. Sheverdyaeva, S.K. Mahatha, P. Moras, L. Petaccia, G. Fratesi, G. Onida, C. Carbone
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