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Publication Citation: Metallicity and Gap States in Tunneling to Fe Clusters on GaAs(110)

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Author(s): P First; Joseph A. Stroscio; Robert A. Dragoset; Daniel T. Pierce; Robert Celotta;
Title: Metallicity and Gap States in Tunneling to Fe Clusters on GaAs(110)
Published: January 01, 1989
Abstract: We report the characteristics of tunneling to a GaAs(110) 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 {Aring}3, 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 Fe clusters. The decay length of these states has a minimum decay of 3.4 {Aring} at midgap and diverges at the valence- and conduction-band edges.
Citation: Physical Review Letters
Volume: 63
Issue: 13
Pages: pp. 1416 - 1419
Research Areas: Scanning tunneling microscopy (STM)