FisMat2017 - Submission - View

Abstract's title: Supported 2D honeycomb-like materials: the case of silicene
Submitting author: Polina Sheverdyaeva
Affiliation: Consiglio Nazionale delle Ricerche, Istituto di Struttura della Materia
Affiliation Address: Strada Statale 14, Km 163,5, I-34149, Trieste, Italy
Country: Italy
Oral presentation/Poster (Author's request): Oral presentation
Other authors and affiliations: Paolo Moras (Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche), Sanjoy Kr. Mahatha (Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche), Guido Fratesi (ETSF and Dipartimento di Fisica, Università degli Studi di Milano), Giovanni Onida (ETSF and Dipartimento di Fisica, Università degli Studi di Milano), Luca Petaccia (Sincrotrone Trieste S.C.p.A.), Carlo Carbone (Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche)
Abstract

The fascinating electronic properties of graphene have led to the exploration of other single-element 2D materials with honeycomb-like structure, such as silicene, germanene, stanene and phosphorene [1]. Some of these materials are expected to display significant analogies to graphene, in the free-standing form, due to the presence of Dirac cones near the Fermi level [2]. The synthesis on solid surfaces, however, poses questions on the preservation of the 2D character of the electronic states. In this talk I will present the paradigmatic case of silicene on Ag(111), where silicon forms different allotropic honeycomb-like phases [3]. I will show that for all phases symmetry-selective hybridization with the Ag sp-states destroys the π-derived Dirac cone features near the Fermi level, while σ-derived bands at deeper energies are weakly affected by the substrate [4,5].

[1]   S. Balendhran et al., Small 11, 640 (2015).
[2]   L. Matthes et al., J. Phys.: Condes. Matter 25 , 395305 (2013).
[3]   P. Moras et al., J. Phys.: Condens. Matter 26, 185001 (2014).
[4]   S. Mahatha et al., Phys. Rev. B 89, 201416 (2014).
[5]   P. M. Sheverdyaeva et al., ASC Nano 11, 975 (2017).