Pioda, A. and Kičin, S. and Ihn, Thomas and Sigrist, Martin and Fuhrer, A. and Ensslin, Klaus and Weichselbaum, A. and Ulloa, S. E. and Reinwald, Matthias and Wegscheider, Werner
Spatially Resolved Manipulation of Single Electrons in Quantum Dots Using a Scanned Probe.
Physical Review Letters (PRL) 93 (21), p. 216801.
The scanning metallic tip of a scanning force microscope was coupled capacitively to electrons confined in a lithographically defined gate-tunable quantum dot at a temperature of 300 mK. Single electrons were made to hop on or off the dot by moving the tip or by changing the tip bias voltage owing to the Coulomb-blockade effect. Spatial images of conductance resonances map the interaction potential between the tip and individual electronic quantum dot states. Under certain conditions this interaction is found to contain a tip-voltage induced and a tip-voltage-independent contribution.