Experimental study demonstrates single-parameter quantized charge pumping in semiconductor nanowires, indicating that nonadiabatic blockade removes the need for multi-phase drive signals.
Controlled charge pumping in an AlGaAs∕GaAs gated nanowire by single-parameter modulation is experimentally and theoretically studied. Transfer of integral multiples of the elementary charge per modulation cycle is clearly demonstrated. A simple theoretical model shows that such a quantized current can be generated via loading and unloading of a dynamic quasibound state. It demonstrates that nonadiabatic blockade of unwanted tunnel events can obliterate the requirement of having at least two phase-shifted periodic signals to realize quantized pumping.
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Kaestner et al. (2008) studied this question.
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