Constructive role of non-adiabaticity for quantized charge pumping

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 previo...

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Bibliographic Details
Published in:arXiv.org 2010-07
Main Authors: Kaestner, B, Leicht, C, Mirovsky, P, Kashcheyevs, V, Kurganova, E V, Zeitler, U, Pierz, K, Schumacher, H W
Format: Article
Language:English
Subjects:
Adiabatic flow
Frequency ranges
Nanowires
Parameters
Pumping
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1007.2062