SCALING OF THE COULOMB ENERGY DUE TO QUANTUM FLUCTUATIONS IN THE CHARGE ON A QUANTUM-DOT

The charging energy of a quantum dot is measured through the effect of its potential on the conductance of a second dot. This technique allo ws a measurement of the scaling of the dot's charging energy with the conductance of the tunnel barriers leading to the dot. We find that th e charging energy scales quadratically with the reflection probability of the barriers. The observed power law agrees with a recent theory.