Flat Bands near Fermi Level of Topological Line Defects on Graphite

Abstract

Flat bands play an important role in the study of strongly correlated phenomena, such as ferromagnetism, superconductivity, and fractional quantum Hall effect. Here we report direct experimental evidence for the presence of flat bands, close to the Fermi level, in one-dimensional topological defects on graphite seen as a pronounced peak in the tunnelling density of states. Our ab initio calculations indicate that the flat bands with vanishing Fermi velocity originate from sp2 dangling bonds (with antibonding nature) of undercoordinated carbon atoms at the edges of the defects. We further demonstrate that the presence of flat bands could be a universal behavior of 1D defects of graphene/graphite with undercoordinated carbon atoms at the edges of the defects.

References in corpus (9)

• Electric Field Effect in Atomically Thin Carbon Films
• The electronic properties of graphene
• High temperature fractional quantum Hall states
• Fractional quantum Hall states at zero magnetic field
• Nearly-flat bands with nontrivial topology
• Single Layer Behavior and Its Breakdown in Twisted Graphene Layers
• Room-temperature ferromagnetism in graphite driven by 2D networks of point defects
• Graphene valley filter using a line defect
• Edge state on hydrogen-terminated graphite edges investigated by scanning tunneling microscopy

Cited by in corpus (4)

• Direct Probing Stacking Order and Electronic Spectrum of Rhombohedral Trilayer Graphene with Scanning Tunneling Microscopy
• Evidence for room temperature superconductivity at graphite interfaces
• Granular superconductivity below 5~K in SPI-II pyrolytic graphite
• Isolated flat bands in an interlocking-circles lattice