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Metallicity and Gap States in Tunneling to Fe Clusters on GaAs(110)
Published
Author(s)
P First, Joseph A. Stroscio, Robert A. Dragoset, Daniel T. Pierce, Robert Celotta
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.
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)