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



P First, Joseph A. Stroscio, Robert A. Dragoset, Daniel T. Pierce, Robert Celotta


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.
Physical Review Letters


First, P. , Stroscio, J. , Dragoset, R. , Pierce, D. and Celotta, R. (1989), Metallicity and Gap States in Tunneling to Fe Clusters on GaAs(110), Physical Review Letters (Accessed June 3, 2023)
Created December 31, 1988, Updated October 12, 2021