Séminaire proposé par Patrick Soukiassian
Two-dimensional materials are of great interest for the miniaturization of electronic devices and the realization of new functionalities. In particular, silicene, a graphene-like two-dimensional honeycomb structure made of Si atoms, offers new opportunities to scale down further the silicon-based nanotechnologies. The analogy of silicene with graphene is reflected by the existence of Dirac cones in the calculated band structure of its free-standing form . However, in contrast to graphene, silicene was only fabricated in epitaxial forms with electronic and structural properties deviating from those of free-standing silicene. Among the very few substrates on which silicene has been experimentally observed, (0001)-oriented zirconium diboride (ZrB2) thin films grown on Si(111) have the unique capability of promoting the spontaneous and self-terminating growth of a silicene sheet made of atoms segregating from the Si substrate [2,3].
n this talk, I will present an overview of the structural, electronic and chemical properties [4-7] of this exotic form of silicon we investigated experimentally using various techniques including scanning tunneling microscopy and angle-resolved photoemission spectroscopy and by means of density functional theory calculations