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Electronic States of Silicene Allotropes on Ag(111)

TitleElectronic States of Silicene Allotropes on Ag(111)
Publication TypeJournal Article
Year of Publication2017
AuthorsSheverdyaeva, P. M., Mahatha S. K., Moras P., Petaccia L., Fratesi G., Onida G., & Carbone C.
Keywordsangle-resolved photoemission spectroscopy (ARPES); density functional theory (DFT); low-energy electron diffraction (LEED); silicene
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 photo emission and first-principles calculations show that these silicene structures, with (4x4), (root 13x root 13)R13.9 degrees, and (2 root 3x2 root 3)R30 degrees 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.

JournalACS NANO
Volume11
Pagination975-982
DOI10.1021/acsnano.6b07593
Date PublishedJAN
Type of ArticleArticle
Citation Key ISI:000392886500103