Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-12-23
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
5 pages
Scientific paper
We provide a thorough study of a carbon divacancy, a fundamental but almost unexplored point defect in graphene. Low temperature scanning tunneling microscopy (STM) imaging of irradiated graphene on different substrates enabled us to identify a common two-fold symmetry point defect. Our first principles calculations reveal that the structure of this type of defect accommodates two adjacent missing atoms in a rearranged atomic network formed by two pentagons and one octagon, with no dangling bonds. Scanning tunneling spectroscopy (STS) measurements on divacancies generated in nearly ideal graphene show an electronic spectrum dominated by an empty-states resonance, which is ascribed to a spin-degenerated nearly flat band of $\pi$-electron nature. While the calculated electronic structure rules out the formation of a magnetic moment around the divacancy, the generation of an electronic resonance near the Fermi level, reveals divacancies as key point defects for tuning electron transport properties in graphene systems.
Brihuega Ivan
Gómez-Rodríguez José M.
Hiebel Fanny
Mallet Pierre
Ugeda Miguel M.
No associations
LandOfFree
Electronic and structural characterization of divacancies in irradiated graphene does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Electronic and structural characterization of divacancies in irradiated graphene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic and structural characterization of divacancies in irradiated graphene will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-192877