Abstract
We have applied scanning tunneling microscopy (STM), scanning tunneling spectroscopy (STS) as well as current imaging tunneling spectroscopy (CITS) [1] to an Al nanocluster periodic array of a submonolayer-Al/Si(111) system. These clusters become visible with an Al deposition thickness of 0.24–0.5 ML at a substrate temperature of 550 °C. The site-resolved STS spectra of the Al nanocluster at 78 K show an insulating energy gap of 3.4 eV. In the CITS images, we have found different features of space-resolved tunneling current for the filled and empty states, which markedly depend on atomic sites and also on inequivalent half unit cells.
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