Observation of Quantum Fluctuations of Charge on a Quantum Dot

Details Observation of Quantum Fluctuations of Charge on a Quantum Dot Observation of Quantum Fluctuations of Charge on a Quantum Dot

1998-03-31

arxiv.org/abs/cond-mat/9803373v3

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Revtex, 5 pages, 3 figures, few minor corrections to the references

Scientific paper

10.1103/PhysRevLett.82.161

We have incorporated an aluminum single electron transistor directly into the defining gate structure of a semiconductor quantum dot, permitting precise measurement of the charge in the dot. Voltage biasing a gate draws charge from a reservoir into the dot through a single point contact. The charge in the dot increases continuously for large point contact conductance and in a step-like manner in units of single electrons with the contact nearly closed. We measure the corresponding capacitance lineshapes for the full range of point contact conductances. The lineshapes are described well by perturbation theory and not by theories in which the dot charging energy is altered by the barrier conductance.

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