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

Published

January 1, 1989

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.

Citation

Physical Review Letters

Volume

63

Issue

13

Pub Type

Journals

Citation

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 November 20, 2025)