Trapping Surface Electrons on Graphene Layers and Islands

Abstract

We report the use of time- and angle-resolved two-photon photoemission to map the bound, unoccupied electronic structure of the weakly coupled graphene/Ir(111) system. The energy, dispersion, and lifetime of the lowest three image-potential states are measured. In addition, the weak interaction between Ir and graphene permits observation of resonant transitions from an unquenched Shockley-type surface state of the Ir substrate to graphene/Ir image-potential states. The image-potential-state lifetimes are comparable to those of mid-gap clean metal surfaces. Evidence of localization of the excited electrons on single-atom-layer graphene islands is provided by coverage-dependent measurements.

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• Time-Resolved Momentum Microscopy with a 1 MHz High-Harmonic Extreme Ultraviolet Beamline
• Mapping Image Potential States on Graphene Quantum Dots
• Model potential for the description of metal/organic interface states
• Scattering resonances in graphene
• Energy bands in graphene: Comparison between the tight-binding model and {\it ab initio} calculations
• A Two-Dimensional Metal-Organic Framework on Superconducting NbSe${}_2$
• Microanalysis of single-layer hexagonal boron nitride islands on Ir(111)
• Mapping Unoccupied Electronic States of Freestanding Graphene by Angle-Resolved Low-Energy Electron Transmission
• Formation of image-potential states at the graphene/metal interface
• One-dimensional potential for image-potential states on graphene
• Electronic structure of graphene: (nearly) free electrons bands vs. tight-binding bands
• Ultrafast dynamics of photocurrents in surface states of 3D topological insulators