Localized description of surface energy gap effects in the resonant charge exchange between atoms and surfaces

The resonant charge exchange between atoms and surfaces is described by considering a localized atomistic view of the solid within the Anderson model. The presence of a surface energy gap is treated within a simplified tight-binding model of the solid, and a proper calculation of the Hamiltonian ter...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2011-02, Vol.23 (4), p.045003-8
Main Authors: Iglesias-García, A, García, Evelina A, Goldberg, E C
Format: Article
Language:English
Subjects:
Adsorbates
Charge exchange
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Fermi level
Fermi surfaces
Interference
Mathematical models
Physics
Surface and interface electron states
Surface energy
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Summary:The resonant charge exchange between atoms and surfaces is described by considering a localized atomistic view of the solid within the Anderson model. The presence of a surface energy gap is treated within a simplified tight-binding model of the solid, and a proper calculation of the Hamiltonian terms based on a LCAO expansion of the solid eigenstates is performed. It is found that interference terms jointly with a surface projected gap maximum at the Γ point and the Fermi level inside it, lead to hybridization widths negligible around the Fermi level. This result can explain experimental observations related to long-lived adsorbate states and anomalous neutral fractions of low energy ions in alkali/Cu(111) systems.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/23/4/045003