Figure 2

Stability of the pumped current.

Pumped current as a function of the plunger gate voltage, V_PL, and the barrier right gate voltage, V_BR, (left columns) and of the plunger gate voltage and the barrier left gate voltage, V_BL, (right columns) with different amplitudes on BL (a) and BR (b). The frequencies are 200 MHz in (a) and 100 MHz in (b). Magenta (a) and cyan (b) color indicate pumping regions where I/ef = ±1 within 5%. The parameter values used in (a) are the same as in Fig. 1(d) except for V_BL = 0.9 V in the left column, V_BR = 0.725 V in the right column, and A_BR = 123 mV in both columns. In (b) the values are the same as in (a) except for V_BL = 0.814 V in left column, V_BR = 0.85 V in the right column, A_BL = 112 mV and A_PL = 205 mV in both columns, and ϕ_BL-PL = 120°. (c) Maximum plateau length in the plunger dc voltage as a function of the exit barrier amplitude extracted from (a) for BL (black squares) and from (b) for BR (red circles) as the exit barrier.