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Physical Review Letters – 19 November 2004
Volume 93, Issue 21

Conductance patterns of a quantum dot as the position and voltage of the tip of a scanning force microscope above the sample surface is varied. The fringe patterns indicate the expulsion of single electrons from the dot in the Coulomb blockade regime. With increasing tip voltage (top left), the spatial pattern becomes complicated due to an interplay of bare interaction and screening. [A. Pioda, S. Kičin, T. Ihn, M. Sigrist, A. Fuhrer, K. Ensslin, A. Weichselbaum, S. E. Ulloa, M. Reinwald, and W. Wegscheider, Phys. Rev. Lett. 93, 216801 (2004)]

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