Figure 4
(Color online) (a) Average peak spacing versus the inverse area of segment I,
, in the
(black filled circles) and
(red open circles) configurations, for devices
through
as indicated. The blue dashed line is the peak spacing estimated by
, where
is a parallel-plate capacitance between the TG and GNR (see text). The values of
were also computed numerically by considering an island of area
(black dotted line) (Ref.
20). (b) Average addition energy extracted from Coulomb diamonds measured in the
(black filled squares) and
(red open squares) configurations versus
. The error bars in (a) and (b) represent standard deviation. Inset: the island size in the direction along the ribbon length
for devices
and
in both
(black filled diamonds) and
(red open diamonds) regimes extracted from the back gate capacitances. (c) and (d) Schematic illustrations of the device, with
representing the scattering sites and the island enclosed in dashed lines. The underlying energy diagrams for the
(c) and
(d) regimes are also shown where the gray band represents the transport gap in the GNRs.
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