Silicene on Ag(111): an honeycomb lattice without Dirac bands

Abstract

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 π-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 π-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 π-character.

arXiv comment14 pages, 4 figures

References in corpus (15)

• The electronic properties of graphene
• Two and one-dimensional honeycomb structures of silicon and germanium
• Quantum Spin Hall Effect in Silicene
• Epitaxial Growth of a Silicene Sheet
• Evidence of silicene in honeycomb structures of silicon on Ag(111)
• Electronic structure of silicon-based nanostructures
• Evidence for Dirac Fermions in a honeycomb lattice based on silicon
• Growth of silicene layers on Ag(111): unexpected effect of the substrate temperature
• Valley-Spin Polarization in the Magneto-Optical Response of Silicene and Other Similar 2D Crystals
• Spontaneous Symmetry Breaking and Dynamic Phase Transition in Monolayer Silicene
• On the electronic structure of silicene on Ag substrate: strong hybridization effects
• Does Silicene on Ag(111) Have a Dirac Cone?
• Electronic Structure and Quasiparticle Band Gap of Silicene Structures
• Coexistence of multiple silicene phases in silicon grown on Ag(111)
• An Artificially Lattice Mismatched Graphene/Metal Interface: Graphene/Ni/Ir(111)

Cited by in corpus (16)

• Layer k-projection and unfolding electronic bands at interfaces
• Direct Evidence of Interaction-Induced Dirac Cones in Monolayer Silicene/Ag(111) System
• Revealing the substrate origin of the linear dispersion of silicene/Ag(111)
• Designing substrates for silicene and germanene: First-principles calculations
• Compelling experimental evidence of a Dirac cone in the electronic structure of a 2D Silicon layer
• Plasmon properties and hybridization effects in Silicene
• The role of surface chemical reactivity in the stability of electronic nanodevices based on two-dimensional materials "beyond graphene" and topological insulators
• Superstructure-induced splitting of Dirac cones in silicene
• Dirac Cone Pairs in Silicene Induced by Interface Si-Ag Hybridization: A First Principles Effective Band Study
• Experimental and theoretical determination of σ-bands on ("2$\sqrt{3}$x2$\sqrt{3}$") silicene grown on Ag(111)
• Crossover between Silicene and Ultra-Thin Si Atomic Layers on Ag(111) Surfaces
• Interband $\pi$-like plasmon in silicene grown on silver
• Emergence of Dirac-like bands in the monolayer limit of epitaxial Ge films on Au(111)
• Electronic structure of a 3x3-ordered silicon layer on Al(111)
• Tailoring topological states in silicene using different halogen-passivated Si(111) substrates
• Topological transition in monolayer blue phosphorene with transiton-metal adatom under stain