Spatially resolved manipulation of single electrons in quantum dots using a scanned probe

Details Spatially resolved manipulation of single electrons in quantum dots using a scanned probe Spatially resolved manipulation of single electrons in quantum dots using a scanned probe

2004-11-10

arxiv.org/abs/cond-mat/0411264v1

Phys. Rev. Lett. 93, 216801 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.93.216801

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.

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