ABSTRACT
Again we consider the electron box structure, figure Fig. 11.1. First, the structure excited by a current source is described. It predicts the behavior when excited by an constant bounded current. To find the values of the voltage across the tunnel junction that allow for tunnel events, the critical voltages, we consider the tunnel events in which one electron tunnels
towards the island on which already n additional electrons are stored:
In fact this circuit was already described in the previous chapter. Figure Fig. 11.2 shows the behavior. The critical voltage for tunneling through the tunnel junction is e/2CT J. Immediately after tunneling of an electron the current source starts to recharge the tunnel junction; it does this by first discharging the junction capacitance from (-e/2) to zero (realize that the voltage is negative) and second by charging the the junction capacitance from zero to e/2 again. After charging, a next electron can and will tunnel.
