Physics – Condensed Matter – Materials Science
Scientific paper
2007-12-12
Journal of Nanoscience and Nanotechnology Vol.9, No.8, P.4700-4708, (2009)
Physics
Condensed Matter
Materials Science
8 pages, 4 figures
Scientific paper
10.1166/jnn.2009.1086
We report on the experimental observation by scanning tunneling microscopy at low temperature of ring-like features that appear around Co metal clusters deposited on a clean (110) oriented surface of cleaved p-type InAs crystals. These features are visible in spectroscopic images within a certain range of negative tunneling bias voltages due to the presence of a negative differential conductance in the current-voltage dependence. A theoretical model is introduced, which takes into account non-equilibrium effects in the small tunneling junction area. In the framework of this model the appearance of the ring-like features is explained in terms of interference effects between electrons tunneling directly and indirectly (via a Co island) between the tip and the InAs surface.
Maslova N. S.
Muzychenko D. A.
Panov V. I.
Savinov S. V.
Schouteden Koen
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