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Metallicity and gap states in tunneling to Fe clusters in GaAs(110).

We report the characteristics of tunneling to a GaAsO 10) substrate with distinct, nanometer-size Fe clusters, as a function of distance from and size of the clusters. We show that Fe clusters of volumes ∼ 150 A3, corresponding to ≃13 atoms, are observed to be nonmetallic with a gap at the Fermi level. Larger clusters with > 35 atoms begin to show metallic characteristics. We observe a continuum of cluster-induced gap states in tunneling to the GaAs substrate surrounding the metallic Fc clusters. The decay length of these states has a minimum decay of 3.4 A at midgap and diverges at the valence- and conduction-band edges.