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arXiv · 0712.2012

Low-temperature scanning tunneling microscopy of ring-like surface electronic structures around Co islands on InAs(110) surfaces

D. A. Muzychenko·K. Schouteden·S. V. Savinov·N. S. Maslova·V. I. Panov·C. Van Haesendonck
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Abstract

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.

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D. A. Muzychenko, K. Schouteden, S. V. Savinov, N. S. Maslova, V. I. Panov, C. Van Haesendonck. 2007-12-12. Low-temperature scanning tunneling microscopy of ring-like surface electronic structures around Co islands on InAs(110) surfaces. https://doi.org/10.1166/jnn.2009.1086

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