Figure 6.

The bipolar conductance tuning to randomly determined target states (5.5 nS ± 1% and 10 nS ± 1%) under pulses with different initial states: (a) the initial state is 2.41 nS, and the target conductance state is obtained by 5.7 V positive pulses for rough-tuning and −5 V negative pulses for fine-tuning; (b) the initial state is 13.5 nS, and the target conductance state is obtained by −5.7 V negative pulses for rough-tuning and 5 V positive pulses for fine-tuning; (c) the initial state is 2.2 nS, and the target state is obtained only by rough-tuning; and (d) the initial state is 23 nS, and the target state is obtained by rough-tuning and fine-tuning methods.