Constructive role of non-adiabaticity for quantized charge pumping

Physics – Condensed Matter – Mesoscale and Nanoscale Physics

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Presented at ICPS 2010, July 25 - 30, Seoul, Korea

Scientific paper

10.1063/1.3666395

We investigate a recently developed scheme for quantized charge pumping based on single-parameter modulation. The device was realized in an AlGaAl-GaAs gated nanowire. It has been shown theoretically that non-adiabaticity is fundamentally required to realize single-parameter pumping, while in previous multi-parameter pumping schemes it caused unwanted and less controllable currents. In this paper we demonstrate experimentally the constructive and destructive role of non-adiabaticity by analysing the pumping current over a broad frequency range.

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