Figure 1
Illustration: Alan Stonebraker

Figure 1: Steady-state picture of Coulomb blockade in a nanoscale tunneling junction in which a quantum dot is weakly connected to two leads. Electrons can tunnel only if the bias voltage V is large enough to line up the chemical potential of the left lead (μL) and an empty level. Otherwise the access is blocked due to the Coulomb repulsion caused by the filled N-electron level.