Abstract
Nanobridges in thin 1–3 nm granular bismuth quench-condensed films with lengths and widths of 10 nm have been formed on top of an electrostatic gate made of oxidized aluminum. Periodic gate modulation of the Coulomb blockade-type I( V) curves of these nanoconstrictions has been observed in the temperature range 4.2–11 K, indicating that the charge of a single grain controlled the transport in the constriction. A reversible transition between two states with the same charging energy of 35 meV occurred at a temperature around 8 K, with up to 5 times enhanced conductivity at low temperatures.
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