First-principles calculation of field emission from metal surfaces
نویسندگان
چکیده
The field-emission current from realistic metal surfaces is evaluated within the density-functional theory using the Landauer-Büttiker approach. The electronic density in the surface region and the potential barrier induced by the finite electric field are calculated self-consistently using a Green’s-function embedding scheme and the full-potential linearized-augmented plane-wave method. Application of this formalism to the ~100! and ~111! faces of Au and Cu demonstrates the sensitivity of the field-emission current to the surface electronic structure close to the Fermi energy.
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