title: Electronic States of Silicene Allotropes on Ag(111).
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.
authors.affiliation: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche , Strada Statale 14 km 163.5, I-34149 Trieste, Italy.
authors.forename: Polina M
authors.identifier: 0000-0002-4231-1638
authors.initials: PM
authors.lastname: Sheverdyaeva
authors.affiliation: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche , Strada Statale 14 km 163.5, I-34149 Trieste, Italy.
authors.forename: Sanjoy Kr
authors.initials: SK
authors.lastname: Mahatha
authors.affiliation: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche , Strada Statale 14 km 163.5, I-34149 Trieste, Italy.
authors.forename: Paolo
authors.initials: P
authors.lastname: Moras
authors.affiliation: Elettra Sincrotrone Trieste , Strada Statale 14 km 163.5, I-34149 Trieste, Italy.
authors.forename: Luca
authors.initials: L
authors.lastname: Petaccia
authors.affiliation: ETSF and Dipartimento di Fisica, Università degli Studi di Milano , Via Celoria, 16, I-20133 Milano, Italy.
authors.forename: Guido
authors.initials: G
authors.lastname: Fratesi
authors.affiliation: ETSF and Dipartimento di Fisica, Università degli Studi di Milano , Via Celoria, 16, I-20133 Milano, Italy.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Onida
authors.affiliation: Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche , Strada Statale 14 km 163.5, I-34149 Trieste, Italy.
authors.forename: Carlo
authors.initials: C
authors.lastname: Carbone
keywords: angle-resolved photoemission spectroscopy (ARPES); density functional theory (DFT); low-energy electron diffraction (LEED); silicene