title: Low-temperature scanning tunneling microscopy of ring-like surface electronic structures around Co islands on InAs(110) surfaces.
abstract: We report on the experimental observation by scanning tunneling microscopy at low temperature of ring-like features that appear around Co metal islands 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.
authors.affiliation: Faculty of Physics, Moscow State University, 119992 Moscow, Russia.
authors.forename: D A
authors.initials: DA
authors.lastname: Muzychenko
authors.forename: K
authors.initials: K
authors.lastname: Schouteden
authors.forename: S V
authors.initials: SV
authors.lastname: Savinov
authors.forename: N S
authors.initials: NS
authors.lastname: Maslova
authors.forename: V I
authors.initials: VI
authors.lastname: Panov
authors.forename: C
authors.initials: C
authors.lastname: Van Haesendonck