AI Article Synopsis
- The study examines the electronic state structure of an Ir(111)/graphene surface influenced by the arrangement of Ir clusters using two-photon photoemission spectroscopy.
- The presence and configuration of Ir clusters significantly alter the image potential states of the graphene substrate, affecting electron behavior at the surface due to the clusters' influence on electron screening.
- A symmetrical arrangement of the Ir clusters leads to reduced areas of uniform local work function in graphene, limiting the excitation of electrons in certain conditions and demonstrating lateral confinement effects due to shrinking unaffected graphene regions.
Article Abstract
The bound unoccupied electronic state structure of an Ir(111)/graphene surface covered by differently sized and spaced Ir clusters was investigated by means of two-photon photoemission spectroscopy. The cluster lattice was found to affect the image potential states of the substrate to a surprisingly large extent. This effect can be related to the influence of the cluster lattice on the screening of the image state electron trapped in front of the surface. The symmetric arrangement of Ir clusters considerably reduces the lateral extension of graphene areas with a homogeneous local work function, and from a certain minimum area size, the excitation of an electron to a stable state in a Coulomb-like potential is not possible anymore. Furthermore, lateral confinement effects could be observed due to the decreasing extension of bare graphene areas.
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| http://dx.doi.org/10.1063/1.5052643 | DOI Listing |
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