Scanning tunnelling spectroscopy and Raman spectroscopy of monolayer silicene on Ag(111)

摘要

Low temperature scanning tunnelling spectroscopy and Raman spectroscopy were used to study the electronic and vibrational properties of silicene formed on the Ag(111) surface for coverage up to one monolayer in the temperature range 230-250 degrees C. The tunnelling spectra reveal the strong contribution of silver states in the measured density of states around the Fermi level. The Raman spectra are found to evolve as a function of the submonolayer coverages, giving rise at one monolayer coverage to peaks that are characteristic of chemical bonds with distorted sp(3) hybrid orbitals. Such properties account for the electronic transparency of the silicene/Ag(111) interface. (C) 2016 Elsevier B.V. All rights reserved.