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Single-parameter nonadiabatic quantized charge pumping
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DOI：10.1103/PhysRevB.77.153301.png)
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Abstract
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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.
Keywords:
SURFACE ACOUSTIC-WAVES
QUANTUM-DOT TURNSTILE
ELECTRON PUMP
TRANSPORT
DRIVEN
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