Fermi-edge transmission resonance in graphene driven by a single Coulomb impurity

Abstract

The interaction between the Fermi sea of conduction electrons and a non-adiabatic attractive impurity potential can lead to a power-law divergence in the tunneling probability of charge through the impurity. The resulting effect, known as the Fermi edge singularity (FES), constitutes one of the most fundamental many-body phenomena in quantum solid state physics. Here we report the first observation of FES for Dirac Fermions in graphene driven by isolated Coulomb impurities in the conduction channel. In high-mobility graphene devices on hexagonal boron nitride substrates, the FES manifests in abrupt changes in conductance with a large magnitude $\approx e^2/h$ at resonance, indicating total many-body screening of a local Coulomb impurity with fluctuating charge occupancy. Furthermore, we exploit the extreme sensitivity of graphene to individual Coulomb impurities, and demonstrate a new defect-spectroscopy tool to investigate strongly correlated phases in graphene in the quantum Hall regime.

arXiv comment6 pages, 4 figures. To appear in Physical Review Letters

References in corpus (28)

• The electronic properties of graphene
• Charged Impurity Scattering in Graphene
• Observation of the Fractional Quantum Hall Effect in Graphene
• Measurement of Scattering Rate and Minimum Conductivity in Graphene
• Fractional quantum Hall effect and insulating phase of Dirac electrons in graphene
• Dirac cones reshaped by interaction effects in suspended graphene
• Quantum Hall Ferromagnetism in Graphene
• Coulomb-driven broken-symmetry states in doubly gated suspended bilayer graphene
• Tunable Kondo Effect in Graphene with Defects
• Spin and valley quantum Hall ferromagnetism in graphene
• A new transfer technique for high mobility graphene devices on commercially available hexagonal boron nitride
• The zero-energy state in graphene in a high magnetic field
• Dissipative Quantum Hall Effect in Graphene near the Dirac Point
• Localized Magnetic States in Graphene
• Gate-Controlled Ionization and Screening of Cobalt Adatoms on a Graphene Surface
• Observing Atomic Collapse Resonances in Artificial Nuclei on Graphene
• Unconventional Sequence of Fractional Quantum Hall States in Suspended Graphene
• Orthogonality catastrophe and Kondo effect in graphene
• Tuning Kondo physics in Graphene with gate voltage
• Mapping Dirac Quasiparticles near a Single Coulomb Impurity on Graphene
• Divergent resistance at the Dirac point in graphene: Evidence for a transition in a high magnetic field
• Ultra-low noise field-effect transistor from multilayer graphene
• Localized Spins on Graphene
• Resistance noise in electrically biased bilayer graphene
• Screening Charged Impurities and Lifting the Orbital Degeneracy in Graphene by Populating Landau Levels
• Large low-frequency resistance noise in chemical vapor deposited graphene
• Finite-temperature Fermi-edge singularity in tunneling studied using random telegraph signals
• Reentrant Kondo effect in Landau quantized graphene