Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

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 May 20, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created December 31, 1988, Updated October 12, 2021