Unconventional scanning tunneling conductance spectra for graphene

Abstract

We compute the tunneling conductance of graphene as measured by a scanning tunneling microscope (STM) with a normal/superconducting tip. We demonstrate that for undoped graphene with zero Fermi energy, the first derivative of the tunneling conductance with respect to the applied voltage is proportional to the density of states of the STM tip. We also show that the shape of the STM spectra for graphene doped with impurities depends qualitatively on the position of the impurity atom in the graphene matrix and relate this unconventional phenomenon to the pseudopsin symmetry of the Dirac quasiparticles in graphene. We suggest experiments to test our theory.

6 pages, 3 figures

References in corpus (23)

• The electronic properties of graphene
• Detection of Individual Gas Molecules Absorbed on Graphene
• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Unconventional quantum Hall effect and Berry's phase of 2pi in bilayer graphene
• Unconventional Integer Quantum Hall effect in graphene
• Scanning tunneling spectroscopy of high-temperature superconductors
• Specular Andreev reflection in graphene
• Josephson effect in ballistic graphene
• Novel electric field effects on Landau levels in Graphene
• Localized Magnetic States in Graphene
• The Ground State of the Pseudogap in Cuprate Superconductors
• Tunneling conductance of graphene NIS junctions
• Quasiparticle Chirality in Epitaxial Graphene Probed at the Nanometer Scale
• Orthogonality catastrophe and Kondo effect in graphene
• Tuning Kondo physics in Graphene with gate voltage
• Localized Spins on Graphene
• Theory of Scanning Tunneling Spectroscopy of Magnetic Adatoms in Graphene
• Josephson effect in graphene SBS junctions
• Scanning tunneling spectroscopy of a magnetic atom on graphene in the Kondo regime
• Scanning tunneling spectroscopy with superconducting tips of Al
• Local density of states and scanning tunneling currents in graphene
• Scanning Tunneling Microscopy currents on locally disordered graphene

Cited by in corpus (15)

• Electron-Electron Interactions in Graphene: Current Status and Perspectives
• Kondo Quantum Criticality of Magnetic Adatoms in Graphene
• The Physics of Kondo Impurities in Graphene
• Imaging superconducting vortex core and lattice with the scanning tunneling microscope
• Magnetic Impurities in Graphene
• Observation of Fermi-energy dependent unitary impurity resonances in a strong topological insulator Bi2Se3 with scanning tunneling spectroscopy
• Single or multi-flavor Kondo effect in graphene
• Resonant scattering due to adatoms in graphene: top, bridge, and hollow position
• Anisotropic transport of normal metal-barrier-normal metal junctions in monolayer phosphorene
• Dependence of transport on adatom location for armchair-edge graphene nanoribbons
• Kondo effect of an adatom in graphene and its scanning tunneling spectroscopy
• Orbital symmetry fingerprints for magnetic adatoms in graphene
• Nonequilibrium Kondo effect in a graphene-coupled quantum dot in the presence of a magnetic field
• Edge states, spin transport and impurity induced local density of states in spin-orbit coupled graphene
• Impact of local stacking on the graphene-impurity interaction: theory and experiments