Phys. Rev. Lett. 93, 216801 (2004) [4 pages]Spatially Resolved Manipulation of Single Electrons in Quantum Dots Using a Scanned ProbeReceived 4 June 2004; published 15 November 2004 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. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.216801
DOI:
10.1103/PhysRevLett.93.216801
PACS:
73.23.–b, 07.79.–v
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