Abstract
We describe the behaviour of an isolated quantum dot charged up with an excess of 30 electrons over its equilibrium value. A non-invasive voltage probe with a charge resolution of e/10 is fabricated next to the dot and used to measure the electron decay rate. The system behaves like an artificial nucleus with the electron escape rate following a Poisson distribution. We observe times for tunnelling of electrons out of the dot in excess of 1000 s.
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