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VOLUME 67 (1998) | ISSUE 2 | PAGE 130
Scanning tunneling spectroscopy of charge effects on semiconductor surfaces and atomic clusters
PACS: 61.16.Ch, 68.35.Dv, 71.55.Eq, 73.20.Hb
We have used scanning tunneling microscopy and scanning tunneling spectroscopy at liquid helium temperature to study the electronic structure of in situ cleaved, (110) oriented surfaces of InAs single crystals. Both unperturbed, atomically flat areas and areas with an atomic size defect cluster have been investigated. We show that the anomalous behavior of the local tunneling conductivity which indicates a pronounced enhancement of the semiconductor band gap for the fiat areas, is consistent with band bending induced by charges localized at the tip apex. Atomic size defect clusters contain additional charges which modify the band bending, explaining the different behavior of the tunneling conductivity near the defect cluster. The experimentally observed oscillations of the tunneling conductivity near the band gap edges can be directly related to resonant tunneling through quantized surface states which appear because of the band bending.