Physics – Condensed Matter – Materials Science
Scientific paper
2005-01-11
Phys. Rev. Lett. 94, 056802 (2005)
Physics
Condensed Matter
Materials Science
4 pages, 4 figures
Scientific paper
10.1103/PhysRevLett.94.056802
Single electron charging in an individual InAs quantum dot was observed by electrostatic force measurements with an atomic force microscope (AFM). The resonant frequency shift and the dissipated energy of an oscillating AFM cantilever were measured as a function of the tip-back electrode voltage and the resulting spectra show distinct jumps when the tip was positioned above the dot. The observed jumps in the frequency shift, with corresponding peaks in dissipation, are attributed to a single electron tunneling between the dot and the back electrode governed by Coulomb blockade effect, and are consistent with a model based on the free energy of the system. The observed phenomenon may be regarded as the ``force version'' of the Coulomb blockade effect.
Grütter Peter
Guo Hong
Miyahara Yoichi
Poole Philip
Sachrajda Andy
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