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Free keywords:
quantum dot; Coulomb blockade
Abstract:
An AlGaAs/GaAs lateral quantum dot of triangular shape with a
characteristic size L < 100 nm containing less than ten electrons was
studied. Single-electron oscillations of the conductance G of this dot
were measured at G < e(2)/h. When going from G much less than e(2)/h to
G approximate to 0.5e(2)/h, a decrease was found not only in the
amplitude but also in the period of the oscillations. A calculation of
the 3D-electrostatics demonstrated that this effect is due to a change
in the dot size produced by control voltages. (C) 2003 Elsevier B.V.
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