Figure 2: (IMAGE)

Science China Press

Figure 2:

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Single- and double-electron pumping in ZnO quantum dot: (a) for pump voltage of 3 V and (c) for pump voltage of 2.7 V, respectively. Pumping current as a function of pulse frequency for various bias voltage: for pump voltages of (b) 3 V and (d) 2.7 V.

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