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Summary: period oscillations in both devices, although
the period DVg is approximately doubled in
the 250- versus 500-nm QD. Because DVg is
inversely proportional to the gate capacitance,
DVg 0 e/Cg, and QD size, this comparison
shows that the true size of the confined QD
can be controlled in a predictable manner in
these modulation-doped nanowires (22).
The potential of our approach for encoding
coupled quantum structures has been explored
in modulation-doped silicon nanowires that have
structures of the form nþ-n1-nQD
þ-n2-nQD
þ-
n1-nþ, where n1 are fixed-width tunnel bar-
riers that weakly couple the structure to source
and drain electrodes, and n2 is a variable-width
barrier that couples the two QDs (Fig. 4D, left
panel). The I Vg data recorded from rep-
resentative nanowire devices with three dif-
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