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Gigahertz Quantized Charge Pumping in Bottom-Gate-Defined InAs Nanowire Quantum Dots
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    Gigahertz Quantized Charge Pumping in Bottom-Gate-Defined InAs Nanowire Quantum Dots
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    Institute of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
    Laboratory for Micro- and Nanotechnology, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
    § Center for Quantum Devices and Nano-Science Center, Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark
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    Nano Letters

    Cite this: Nano Lett. 2015, 15, 7, 4585–4590
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    https://doi.org/10.1021/acs.nanolett.5b01190
    Published June 18, 2015
    Copyright © 2015 American Chemical Society

    Abstract

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    Semiconducting nanowires (NWs) are a versatile, highly tunable material platform at the heart of many new developments in nanoscale and quantum physics. Here, we demonstrate charge pumping, that is, the controlled transport of individual electrons through an InAs NW quantum dot (QD) device at frequencies up to 1.3 GHz. The QD is induced electrostatically in the NW by a series of local bottom gates in a state of the art device geometry. A periodic modulation of a single gate is enough to obtain a dc current proportional to the frequency of the modulation. The dc bias, the modulation amplitude and the gate voltages on the local gates can be used to control the number of charges conveyed per cycle. Charge pumping in InAs NWs is relevant not only in metrology as a current standard, but also opens up the opportunity to investigate a variety of exotic states of matter, for example, Majorana modes, by single electron spectroscopy and correlation experiments.

    Copyright © 2015 American Chemical Society

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    Supporting Information

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    Quantum dot characteristics in the single-dot regime.

    Electrostatic model of quantized charge pumping.

    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.nanolett.5b01190.

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    This article is cited by 22 publications.

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    2. E. Enrico, L. Croin, E. Strambini, F. Giazotto. Single charge transport in a fully superconducting SQUISET locally tuned by self-inductance effects. AIP Advances 2022, 12 (5) https://doi.org/10.1063/5.0084168
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    Nano Letters

    Cite this: Nano Lett. 2015, 15, 7, 4585–4590
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.nanolett.5b01190
    Published June 18, 2015
    Copyright © 2015 American Chemical Society

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